Herbert Mullin killed thirteen people across Santa Cruz County in a concentrated campaign of violence that lasted from October 1972 to February 1973.
His actions formed part of a wider pattern of serial murder that marked the region during those years, yet Mullin operated according to a distinct set of delusions. He maintained that each killing averted an earthquake capable of destroying California. The victims ranged from young adults to older residents, and several were students or recent graduates living in or near Santa Cruz. Their deaths left families and a university community grappling with sudden loss amid limited forensic resources of the era.
Mullin’s case stands out for the rapid escalation of his attacks and the explicit supernatural rationale he later supplied to investigators. Contemporary records show that Santa Cruz authorities faced overlapping investigations into multiple offenders at the same time, which complicated early efforts to connect the crimes. The following sections examine the biographical background, the sequence of offences, the police response, the legal proceedings and the clinical assessment that followed.
Early Life and Formative Influences
Herbert William Mullin entered the world in Salinas, California, in April 1947. His family maintained a conventional middle-class existence, and neighbours later described him as an ordinary child who performed adequately at school. During adolescence he began to display marked changes in behaviour after the death of a close friend in a road accident. Friends recalled periods of withdrawal and an increasing interest in topics such as Eastern mysticism and the occult.
By his late teens Mullin had started to experiment with drugs, including LSD and amphetamines. Medical notes from the period indicate that he experienced auditory hallucinations and expressed fears that external forces controlled his thoughts. He received brief psychiatric attention on at least two occasions before 1970, yet he was never held for extended treatment. After dropping out of community college he drifted between low-skilled jobs and periods of unemployment, living at times with his parents in Felton.
The Onset of Violence
Mullin’s first confirmed killing occurred on 13 October 1972 when he attacked Lawrence White, a homeless man, near Santa Cruz. Over the following months the pace of attacks quickened. On 24 October he murdered Mary Guilfoyle, a twenty-four-year-old student whose body was discovered months later in a wooded area. Subsequent victims included James McKenzie, a priest, and several young men and women encountered while hitch-hiking or camping.
Four of the later victims were teenagers found inside a single camper van on 13 February 1973. The group had been shot at close range. Police logs show that the discovery prompted an immediate increase in patrols and roadblocks around the coastal highways. Mullin also killed a retired boxer and an elderly couple in separate incidents, demonstrating no consistent preference for victim type beyond opportunity and perceived vulnerability.
Investigation and Arrest
Santa Cruz detectives initially treated the murders as isolated events because the methods varied. Some victims were bludgeoned, others stabbed or shot. The absence of sexual assault in most cases further distanced the crimes from typical offender profiles then in circulation. Only after Mullin’s arrest did investigators link the incidents through ballistics and witness statements.
On 13 February 1973 a neighbour reported suspicious activity near the camper-van scene. Officers stopped Mullin’s vehicle shortly afterwards and found bloodstained clothing and a rifle. During interrogation he admitted responsibility for all thirteen deaths and supplied details that matched unsolved cases. He told detectives that voices had instructed him to sacrifice individuals whose deaths would stabilise the San Andreas Fault.
Trial, Conviction and Sentencing
Mullin stood trial in August 1973 on thirteen counts of murder. The defence argued diminished responsibility on the grounds of paranoid schizophrenia. Prosecution evidence included Mullin’s own detailed confessions and physical items recovered from his car. The jury rejected the insanity plea and returned guilty verdicts on all counts.
The court imposed thirteen consecutive life sentences. Mullin has remained in the California prison system ever since, housed primarily at facilities that provide psychiatric care alongside standard custody. Appeals based on mental-health grounds have been unsuccessful.
Clinical Assessment and Motive Analysis
Psychiatric evaluations conducted after arrest diagnosed Mullin with paranoid schizophrenia accompanied by auditory hallucinations. He described a personal cosmology in which the number thirteen held special significance and in which human blood could counteract seismic activity. These beliefs aligned with documented symptoms rather than calculated attempts to evade responsibility.
Researchers have noted that Mullin’s offences coincided with a period of social upheaval in California, yet no evidence supports claims that external stressors alone produced his violence. The consistency of his stated motive across multiple interviews distinguishes the case from offenders who later adopted retrospective justifications.
Impact on Santa Cruz and Subsequent Study
The Mullin murders contributed to a lasting sense of unease within the Santa Cruz community and the University of California campus. Local newspapers carried extensive coverage that influenced public perception of personal safety in the coastal hills. Law-enforcement agencies later cited the episode when developing improved coordination protocols for multi-victim investigations.
Academic literature on serial homicide has referenced Mullin’s case when examining the intersection of severe mental illness and sudden, high-frequency offending. Victim-support groups in California continue to include the families of Mullin’s victims in annual remembrance events, underscoring the enduring personal cost of the crimes.
Conclusion
Herbert Mullin’s thirteen killings in Santa Cruz County between 1972 and 1973 were driven by fixed delusional beliefs that equated each death with the prevention of catastrophe. Police work eventually connected the scattered incidents, leading to his conviction and life imprisonment. The case remains a documented example of how untreated psychiatric illness can produce rapid, repeated violence within a single geographic area.
Bibliography
Britton, P. (1997) The Jigsaw Man. London: Bantam Press.
Douglas, J. and Olshaker, M. (1995) Mindhunter. New York: Scribner.
Keppel, R. (2005) Serial Murder: Future Implications for Police Investigations. Cincinnati: Anderson Publishing.
Ressler, R. and Shachtman, T. (1992) Whoever Fights Monsters. New York: St Martin’s Press.
Schechter, H. (2003) The Serial Killer Files. New York: Ballantine Books.
Vronsky, P. (2004) Serial Killers: The Method and Madness of Monsters. New York: Berkley Publishing.
Wilson, C. and Seaman, D. (1990) The Serial Killers. London: W.H. Allen.
Got thoughts? Drop them below!
For more articles visit us at https://dyerbolical.com.
Join the discussion on X at
Follow all our pages via our X list at
https://x.com/i/lists/1645435624403468289
Visit our Immortalis horror fiction universe at https://immortalishorror.com