Hillside Stranglers: Kenneth Bianchi and Angelo Buono Jr. committed a series of abductions, sexual assaults, and murders targeting female victims in Los Angeles during 1977 and 1978. Posing as police officers, the cousins brought victims to a Glendale property before disposing of their bodies along hillsides and roadsides.
Bianchi’s arrest for two additional murders in Washington in 1979 linked the pair to the Los Angeles crimes. After court-appointed evaluators rejected Bianchi’s claim of multiple personality disorder, he pleaded guilty. Corroborating physical evidence helped prosecutors convict Buono of nine murders despite Bianchi’s unreliable testimony.
The Hillside
Stranglers
Kenneth Bianchi, Angelo Buono, the ten Los Angeles murders, the Bellingham killings, the fake-police ruse, the forensic trail, and the trial that almost disappeared before it began.
What Were the Hillside Strangler Murders?
The case before the mythology.
The Hillside Strangler murders were a series of kidnappings, sexual assaults and strangulation murders committed in Los Angeles County in 1977 and 1978 by cousins Kenneth Bianchi and Angelo Buono Jr. Their victims were women and girls aged 12 to 28. The pair sometimes impersonated police officers, took victims to Buono’s Glendale property, and left bodies on hillsides and roadside embankments. After Bianchi moved to Bellingham, Washington, he murdered two additional women in January 1979; his arrest broke the Los Angeles case open.
Case Snapshot
Two offenders, two states, one evidentiary chain.
Ten victims
The linked California sequence ran from October 1977 through February 1978. Bodies were discovered across Los Angeles-area hillsides, roadsides and urban margins.
Two more murders
Karen Mandic and Diane Wilder were murdered in Bellingham in January 1979 after Bianchi had left California. Those killings led directly to his arrest.
“Strangler” was not one man
The press nickname began in the singular. Investigators eventually confronted a rarer problem: a murder partnership whose members could reinforce, divide and conceal one another’s conduct.
The Criminal Partnership
Why dyadic crime requires more than a “mastermind and follower” story.
Older cousin / fixed base
Buono ran an automobile upholstery business from his Glendale property. The prosecution tied that location to the crimes through physical evidence, victim-property evidence and Bianchi’s testimony. Buono was eventually convicted of nine murders and sentenced to life without parole.
Younger cousin / deceptive access
Bianchi cultivated authority personas, sought police-related work and used false credentials. His guilty pleas ultimately covered five California murders and the two Bellingham murders. His testimony became central to Buono’s prosecution despite major credibility problems.
Ruse, confinement, assault, disposal
The record describes recurring use of false police authority, transportation to a controlled location, sexual violence, strangulation and secondary body disposal. The partnership made victim control easier and gave each man a witness who was also an accomplice.
Do not diagnose the partnership from headlines
Terms such as “folie à deux,” “psychopath,” “dependent partner,” or “dominant sadist” can be useful hypotheses, but they are not substitutes for the legal record. The strongest analysis begins with conduct, roles, corroboration and changing accounts.
Before the Murders
Exploitation, false authority and the period in which coercion became routine.
Women were being controlled before bodies appeared
Before the homicide series, Bianchi and Buono were already involved in coercive sexual exploitation. Accounts of the period describe young women being pressured into prostitution, controlled through intimidation and treated as sources of income. That history matters because the later murders did not emerge from a social vacuum: abduction, confinement, sexual entitlement and economic exploitation were already present in the partnership.
Police identity without police accountability
Bianchi repeatedly sought the status attached to law enforcement and security work. In the Los Angeles series, false police authority became a practical tool: a badge, command voice or traffic-stop pretext could transform ordinary compliance into captivity. The ruse exploited a victim’s rational expectation that refusing an officer could make the situation worse.
Buono’s property changed the logistics
A controlled Glendale location gave the pair privacy, tools, time and distance from the eventual dump sites. That separation between encounter, assault and disposal complicated the forensic picture: investigators were looking at bodies left on hillsides while the critical indoor environment remained elsewhere.
Biography is not destiny
Later books and profiles often work backward from the murders and turn childhood, sexuality or personality traits into inevitability. This dossier does not. The evidentiary line is behavior: prior exploitation, deception, coercion, police impersonation, shared offending and the physical record that later tied the pair to the murders.
How the Murder System Worked
Access, control, kill site, disposal and the advantages created by two offenders.
The Victims
Twelve names across the combined California and Washington record.
October 1977
The first victim in the Los Angeles sequence. Her killing became an early anchor for investigators trying to understand the pair’s connections to prostitution and street-level exploitation.
October 1977
A teenage victim whose case later carried important trace-evidence significance in the prosecution narrative.
November 1977
Her murder widened the public sense of risk beyond women associated with street prostitution.
November 1977
An aspiring actress whose remains were found after decomposition complicated the investigation.
November 1977
Abducted with Sonja Johnson. Their ages fundamentally changed the public understanding of the danger.
November 1977
Abducted alongside Dolores Cepeda and later found in the Los Angeles area.
November 1977
Her case became central to later testimony about the offenders’ experimentation with multiple methods of harming and killing victims.
November 1977
Abducted near her home. Her killing was among the crimes that intensified fear across Los Angeles.
December 1977
Her abduction became important to the geographic reconstruction of Bianchi’s movements and addresses.
February 1978
The final victim in the Los Angeles sequence; her body was found in the trunk of her car in the Angeles National Forest area.
January 1979
Western Washington University student murdered in Bellingham after Bianchi moved north.
January 1979
Murdered with Karen Mandic. The Bellingham investigation produced the arrest that reactivated the Los Angeles case.
Victim Pattern Without Victim Blaming
The series widened over time; vulnerability was situational, not moral.
Street visibility was exploited
Some early victims were connected to street-based sex work or nightlife, where offenders could approach women without immediately attracting attention. That does not make them responsible for the risk. It describes the environment the killers chose to exploit.
The target pool widened
Later victims included students, workers and girls encountered in ordinary public settings. The murders of Dolores Cepeda and Sonja Johnson, aged 12 and 14, destroyed any plausible idea that the threat was confined to one adult subculture.
Children through adults
The Los Angeles victims ranged from 12 to 28. That spread is more informative than an offender-generated “type”: it shows that opportunity, control and perceived vulnerability could matter more than a narrow demographic template.
Do not classify people as “high risk” and stop there
Terms such as “high-risk victim” can obscure the actual mechanism. The relevant question is what conditions the offenders manipulated—public trust, transportation, age, isolation, economic vulnerability and the assumption that a badge signaled safety.
The Geography of Disposal
Why the hillsides became the public face of crimes committed elsewhere.
The hillsides were not the whole crime scene
The bodies’ placement along roadsides, embankments and canyon routes created the visual signature that drove the nickname. But many critical acts occurred before disposal. Treating the dump sites as the sole scene risked over-reading geography while missing the indoor environment and transport chain.
Los Angeles helped fragment the evidence
A car-dependent metropolis, multiple police jurisdictions and long corridors between Glendale, Hollywood, foothill roads and canyon areas made a multi-scene homicide series harder to integrate. Investigators had to recognize a pattern across places that were administratively separate.
Discovery was part of the city’s experience
Repeated roadside discoveries meant the case entered public consciousness through visible geography. The city did not experience one hidden crime scene; it experienced a succession of bodies appearing in ordinary travel corridors.
Dump-site patterns do not prove motive
Leaving bodies exposed may reflect haste, access, practical disposal, contempt, a desire for discovery, or several factors at once. The record supports the locations; psychological interpretation of why those locations were chosen requires more caution.
Los Angeles: October 1977 to February 1978
Escalation, variation and the growing visibility of the series.
Yolanda Washington
The first recognized killing in the series. Her body was found near Forest Lawn Drive, beginning a pattern that would soon be publicly associated with hillside disposal.
Judith Miller
The 15-year-old’s case later became important to the physical-evidence story linking victims back toward Buono’s environment.
Kastin, King, Cepeda, Johnson, Weckler
Five killings in roughly two weeks transformed an alarming series into a citywide terror event. Two victims were only 12 and 14.
Lauren Wagner
Her murder reinforced the breadth of victim selection and the offenders’ willingness to abduct women from ordinary residential settings.
Kimberly Martin
Her case produced geographic and communications clues that later mattered when investigators reconstructed Bianchi’s Los Angeles life.
Cindy Hudspeth
The Los Angeles series ended after Hudspeth’s murder. Bianchi later relocated to Washington, creating the break that ultimately exposed the partnership.
The Authority Ruse
How counterfeit legitimacy became a weapon.
“Vice officers”
Contemporary reconstructions describe Bianchi and Buono posing as police or vice officers and displaying false badges. The point was not theatricality for its own sake: authority reduced resistance, created confusion and allowed the men to convert a public encounter into controlled transport.
The ruse weaponized compliance
A person who believes she is being detained by police is placed into a profound decision trap. Resistance may feel dangerous or criminal. The case is therefore also a study in how symbols of state authority can be exploited by offenders.
The 162-Officer Task Force
Scale did not automatically create coordination.
A massive investigation
By early 1978 the Hillside Strangler Task Force had grown to roughly 162 officers drawn from LAPD, the Sheriff’s Department and Glendale. Thousands of tips and enormous volumes of fingerprints and leads poured in. The problem was no longer lack of information; it was deciding which information mattered.
More investigators, more seams
Frank Salerno later described poor coordination across agencies. Different jurisdictions had pieces of the pattern, but evidence did not always move cleanly between them. The case became an example of why serial-crime investigations need unified linkage systems rather than parallel files.
Bianchi moved close to law enforcement
While the Los Angeles murders were being investigated, Bianchi sought police-related work and participated in law-enforcement-adjacent settings. The significance is not that police “should have known” he was a killer from personality alone, but that his authority fixation repeatedly placed him near institutions he also imitated.
The breakthrough came from another jurisdiction
The Los Angeles series did not collapse because the task force finally found a single magic clue. Bellingham detectives arrested Bianchi for two new murders, then contacted California investigators. The decisive linkage came from a new crime scene, a new police agency and a suspect address that suddenly made old evidence coherent.
A City Under Siege
Task-force scale did not eliminate fragmentation.
162 officers at peak
By early 1978 the Hillside Strangler Task Force had grown to 162 officers, with thousands of tips and records to process. The scale shows both the intensity of public pressure and the difficulty of coordinating an investigation spread across multiple agencies and dump sites.
Bianchi surfaced before the break
Later reporting shows that Bianchi’s name appeared during the Los Angeles investigation and that he had even agreed to take a polygraph. Investigators did not yet have the structure or evidence to identify him as one half of a killing pair.
Fibers mattered
At Buono’s trial, prosecutors relied on corroboration beyond Bianchi’s word, including fibers linked to Buono’s shop and other independent evidence. The appellate record later described Bianchi’s testimony as abundantly corroborated by independent evidence.
A failed abduction mattered too
Catherine Lorre, daughter of actor Peter Lorre, told investigators that the cousins had posed as vice officers while trying to abduct her. Her account became one piece in the broader corroboration case.
Bellingham Breaks the Case
Two murders, a smaller investigation, and the mistake that exposed Los Angeles.
The “Multiple Personality” Fight
One of the case’s most enduring forensic-psychology disputes.
“Steve Walker”
During psychological evaluation Bianchi presented an alternate personality called “Steve,” which defense-oriented evaluators interpreted as evidence of multiple personality disorder. The claim became entangled with hypnosis and questions about competence and criminal responsibility.
Experts did not agree
Martin Orne and other evaluators regarded Bianchi as malingering. Published debate continued after the case, including disagreement among clinicians about whether the apparent alternate personality was genuine. The safest historical conclusion is that the court rejected the defense and Bianchi ultimately pleaded guilty.
A real “Steve Walker” existed
Investigators discovered that Bianchi had previously used the identity and academic records of a real person named Steve Walker while posing as a psychology professional. That fact severely damaged the credibility of his claimed alternate persona.
The plea replaced the insanity fight
In October 1979 Bianchi was found competent, withdrew the insanity plea and entered guilty pleas in Washington. He then entered guilty pleas to five California murders and related charges.
The Psychiatry Fight
Hypnosis, “Steve Walker,” expert disagreement and the problem of performance.
Multiple personality disorder
Bianchi claimed amnesia and presented an alternate personality called “Steve” during hypnotic sessions. Some clinicians initially accepted the presentation as genuine, reflecting the diagnostic assumptions and hypnosis culture of the period.
Demand characteristics and malingering
Other evaluators, most famously Martin Orne, argued that Bianchi was adapting his performance to cues from examiners. The dispute became a major teaching case in forensic psychology because it showed how suggestive interviewing can accidentally reward the very symptom pattern being tested.
The name had a real-world history
Investigators learned that “Steve Walker” was not merely a spontaneous alter identity; Bianchi had previously used the identity of a real person in connection with false psychology credentials. That discovery severely damaged the claim that the name emerged independently from dissociation.
The case is evidence about malingering assessment—not a shortcut for DID debates
Bianchi’s presentation is often used as a cultural argument about dissociative identity disorder generally. That goes too far. The case can support conclusions about his conduct, testing context and credibility; it cannot by itself settle the validity of an entire diagnosis.
The Trial That Nearly Vanished
Buono’s prosecution became a test of whether a lying accomplice could still be corroborated.
Prosecutors move to dismiss
Los Angeles prosecutors concluded that Bianchi’s contradictions made the murder case against Buono too unreliable to pursue and sought dismissal.
Judge Ronald George refuses
Judge Ronald M. George reviewed the record and concluded there was sufficient independent corroboration to require prosecution. The California Attorney General’s office ultimately took over the case.
729-day proceeding
From jury selection to verdicts, the trial stretched across 729 days. Contemporary reconstruction records 392 witnesses and 1,807 exhibits, with Bianchi testifying for months.
Nine murder convictions
The jury convicted Buono of nine murders and did not reach a conviction on the Yolanda Washington count. He received life without parole.
Evidence Ledger
What established the case—and what each category could not establish alone.
| Evidence | What it supported | Boundary |
|---|---|---|
| Bianchi guilty pleas | Five California murders plus two Washington murders; conspiracy and related admissions. | A plea establishes legal guilt for the pleaded counts but does not make every later statement reliable. |
| Bianchi testimony | Inside account of Buono’s role, locations, ruses and offense details. | Credibility was heavily attacked because Bianchi lied repeatedly and changed accounts. |
| Fiber/trace evidence | Independent links between victims and Buono’s property/shop. | Trace associations require contextual interpretation and cannot narrate the crime by themselves. |
| Victim property / jewelry | Corroboration tying the offenders to victims. | Possession evidence must be evaluated with chain-of-custody and identification evidence. |
| Witness accounts | Police-impersonation ruse and offender behavior outside the murders. | Memory and identification evidence must be weighed carefully. |
| Bellingham physical evidence | Directly supported the Mandic/Wilder prosecution and brought Bianchi into custody. | Washington evidence did not independently prove every Los Angeles count. |
Sentences, Deaths and the Long Afterlife
The case did not end with the 1983 verdict.
Nine murder convictions
Buono was convicted of nine first-degree murders and sentenced to life imprisonment without the possibility of parole. He died in California custody in 2002. The jury did not convict him on the Yolanda Washington count.
California + Washington sentences
Bianchi pleaded guilty to five California murders and the two Bellingham murders. Washington later set an extraordinarily long minimum term. His later litigation has not erased the guilty pleas that anchored the interstate resolution of the case.
The cooperating killer never became a clean narrator
Bianchi’s plea agreement made him indispensable and dangerous at the same time. He had firsthand knowledge, but also enormous incentives to minimize, redirect and manipulate. The Buono prosecution therefore became a test of whether independent evidence could carry a case built around a compromised accomplice.
The case changed more than serial-killer lore
Its lasting significance lies in multi-agency linkage, trace evidence, accomplice corroboration, forensic assessment of malingering, and the legal question of what prosecutors should do when their essential witness is also a proven liar.
The Veronica Compton Plot
An attempt to manufacture reasonable doubt from prison.
Copycat logic
Veronica Compton, who became involved with Bianchi while he was incarcerated, attempted to strangle a woman in Bellingham. The scheme was intended to create the impression that a Hillside Strangler-style offender remained free while Bianchi was imprisoned.
The victim survived
The targeted woman fought back and escaped. Compton was later convicted of attempted murder. The episode reinforced the extent to which Bianchi continued trying to manipulate the narrative after conviction.
Archival Geography
Place without spectacle: Los Angeles, the hillsides, and the Bellingham break.
Downtown Los Angeles in November 1976, immediately before the murder series. UCLA / Los Angeles Times archive record via Wikimedia Commons.
Angeles Crest Highway, modern context view. Cindy Hudspeth’s body was found in the Angeles National Forest area. Antony-22 / Wikimedia Commons / CC BY-SA 4.0.
Public-domain map highlighting Angeles Crest Highway in the metropolitan road system. Wikimedia Commons public-domain map.
Angelo Buono courtroom photographs
The Los Angeles Times archive preserves trial-era images of Buono and the two-year prosecution. They are linked rather than hotlinked because they remain licensed editorial photography.
Myth vs. Record
The nickname is simpler than the evidence.
There was one “Hillside Strangler”
False. The singular nickname predated discovery of the Bianchi–Buono partnership.
Bianchi’s lies did not erase corroboration
His credibility was badly damaged, but Buono’s conviction did not rest on his testimony alone. Independent evidence became the reason the case survived dismissal.
The insanity defense proved DID
No. Experts disagreed sharply, the court accepted that Bianchi was malingering, and he ultimately abandoned the insanity plea and pleaded guilty.
Do not turn the victims into a body-count graphic
The legal record matters because it gives each victim a place in the case. The two-offender mythology should never become more memorable than the twelve people whose deaths anchor the file.
Hillside Stranglers FAQ
Direct answers to the questions most often flattened by retelling.
Who were the Hillside Stranglers?
Kenneth Bianchi and Angelo Buono Jr., cousins who committed a series of kidnappings, sexual assaults and murders in Los Angeles County in 1977–1978.
How many victims were there?
The Los Angeles series contains ten victims. Bianchi later murdered Karen Mandic and Diane Wilder in Washington, bringing the combined murder record discussed here to twelve.
Why was Buono convicted of nine murders rather than ten?
The jury convicted him of nine Los Angeles murders and did not convict him on the Yolanda Washington count. Bianchi had pleaded guilty to five California murders and the two Washington murders.
Did Bianchi really have multiple personalities?
The claim was heavily disputed. Some evaluators initially supported it; others concluded he was malingering. The court accepted the latter view, and Bianchi abandoned the insanity defense before pleading guilty.
How did Bianchi get caught?
Bellingham police arrested him after the January 1979 murders of Karen Mandic and Diane Wilder. Evidence from that case prompted contact with Los Angeles investigators and exposed his connection to the earlier series.
Why is the Buono trial historically important?
The prosecution nearly dismissed the case because Bianchi was such a compromised witness. Judge Ronald George refused the dismissal after finding substantial corroborating evidence, and the California Attorney General ultimately secured nine murder convictions.
Source Ledger
Court records, legal history and archival reporting before retrospective lore.
In re Personal Restraint of Kenneth A. Bianchi
2022 Washington Court of Appeals opinion summarizing Bianchi’s Washington guilty pleas, California convictions, sentence history and repeated post-conviction claims.
Littlefield v. Superior Court
1982 California Court of Appeal decision arising from Buono’s prosecution and Bianchi’s role as the prosecution’s primary cooperating witness.
Los Angeles Times: trial that nearly did not happen
2025 archival reconstruction covering the task force, Bianchi’s missed appearances in the investigation, the attempted dismissal and the 729-day Buono trial.
HistoryLink: Bellingham murders
Detailed historical reconstruction of the Mandic/Wilder investigation, Bianchi’s arrest, Washington proceedings and the bridge back to Los Angeles.
The Bianchi case: sociopath or multiple personality?
Published clinical debate documenting the competing interpretations of hypnosis, the “Steve” personality and allegations of malingering.
Angelo Buono dies in prison
Los Angeles Times retrospective summarizing his nine murder convictions, life-without-parole sentence and death in custody in 2002.
Ronald M. George: The Hillside Strangler Trial
The trial judge’s later Loyola Law Review foreword is a primary legal-history account of the attempted dismissal, evidentiary posture and extraordinary length of the Buono prosecution.
Bellingham evidence and arrest chronology
HistoryLink preserves a detailed chronology of the Mandic/Wilder investigation, physical evidence, guilty pleas, Buono arrest and later Compton plot.
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