Police discovered a collection of more than 1,000 photographs taken by Alcala, mostly of women and teenage boys, many in sexually explicit poses. Army in 1960, at age 17, where he served as a clerk.

They speculate that some of his photographic subjects could be additional victims. In 1964, after what was described as a "nervous breakdown", during which he went AWOL and hitchhiked from Fort Bragg to his mother's house, he was diagnosed with antisocial personality disorder Other diagnoses later proposed by various psychiatric experts at his trials included narcissistic personality disorder and (from homicide expert Vernon Geberth) malignant narcissistic personality disorder with psychopathy and sexual sadism comorbidities.

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His crime would catch up with him three years later, when the FBI placed him on their most wanted list.

Alcala was extradited back to California, but Tali Shapiro’s family decided that putting her on the stand would only cause the child more trauma.

They say they have turned up additional evidence in their investigation that links Alcala to Thornton’s death.

It’s not known when he will be returned to Wyoming to face charges there.

He was sentenced to death in California in 2010 for five murders committed in that state between 19.

Prosecutors say that Alcala "toyed" with his victims, strangling them until they lost consciousness, then waiting until they revived, sometimes repeating this process several times before finally killing them.

Less than two months after his release, he was re-arrested after assaulting a 13-year-old girl identified in court records as "Julie J.", who had accepted what she thought would be a ride to school.

Once again, he was paroled after serving two years of an "indeterminate sentence".

In 1978, Alcala worked for a short time at the Los Angeles Times as a typesetter, and was interviewed by members of the Hillside Strangler task force as part of their investigation of known sex offenders.

Although Alcala was ruled out as the Hillside Strangler, he was arrested and served a brief sentence for marijuana possession.

To evade the resulting arrest warrant he left the state and enrolled in the NYU film school, using the name "John Berger".