Rodney Alcala, 66, has admitted killing another 30 women in the 1970s and police believe there could be many more victims.
Alcala, who defended himself during his trial, preyed on women and girls by offering to take their photographs. He then raped his victims, strangled them until they were unconscious before reviving them and killing them.
Authorities have released more than 100 photographs of unidentified girls and women in their 20s-30s taken by Alcala fearing they could be the serial killer's victims.
A total of 1,000 photos were retrieved from a storage locker in Seattle, Washington, where Alcala kept them as souvenirs of his victims, police believe.
Alcala was sentenced to death by lethal injection for kidnapping and murdering 12-year-old Robin Samsoe, from Huntington Beach, California, who disappeared on the way to ballet class in 1979.
He was also convicted of murdering four Los Angeles women - Georgia Wixted, 27, Jill Barcomb, 18, Charlotte Lamb, 32, and Jill Parenteau, 21 - between 1977 and 1979.
Serial Killer Rodney Alcala's Sentencing: "You're a Monster" - CBS News
Rodney Alcala could be the US's most prolific serial killer - Times Online
California killer may be linked to Seattle slayings in 1970s - Seattle Times
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