Pamela Jean Pam Lambson was 19 when she disappeared after arranging a photo shoot at Fisherman’s Wharf in San Francisco on October 8, 1977. She had met a man who said he was a photographer at an Oakland A’s game and planned to meet him again for pictures. The next day her battered, naked body was found on a Mount Tamalpais trail in Marin County, a few miles from where she was last seen.

Store clerks where Lambson was last seen described the suspect as handsome and helped produce a detailed police sketch that was circulated nationally. That sketch was later compared to Rodney James Alcala, a convicted killer who sometimes posed as a photographer. Marin County investigators reopened the case in 2011 after photos seized from Alcala’s storage locker were reviewed. Prosecutors did not file charges against Alcala in this case because DNA from the scene had deteriorated and could not yield a positive match, though Marin officials said they were absolutely certain he was responsible.