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A Los Angeles National Forest ranger later testified that a man matching Alcala's description and driving the same make and model of car as him leading a girl down a stream on June 20. When the investigators searched Alcala's mother's house, they found a receipt for a storage locker in Seattle which turned out to contain hundreds of photos, mostly of young girls.
In many of the photos, the subjects are nude or dressed in swimwear. The locker also contained a pair of earrings which had belonged to Samsoe and another pair that was later found to have the DNA of Charlotte Lamb, a 31-year-old woman killed in her apartment building's laundry room in El Segundo in 1978, on them.
Criminal profiler Pat Brown later suggested that this rejection angered Alcala further since he afterwards killed at least three more women within two years.
His last known victim was 12-year-old Robin Samsoe, who was abducted on her way to ballet class in 1979 in Huntington Beach and her decomposing body found in the Sierra Madres twelve days later.
He received indeterminate sentencing, which meant he would be released from incarceration when he proved himself rehabilitated (the system was popular in the 1970s when sex offenders were convicted).
After 34 months, in 1974, he was released and kidnapped a 13-year-old girl named as "Julie J." in court records, forced her to smoke marijuana and kissed her.
In 1977, Alcala got permission from his parole officer to visit relatives in New York City.
When they knocked on the door, he escaped out the back and evaded arrest. In 1971, Alcala is believed to have raped and strangled Cornelia Crilley, a Trans World Airlines flight attendant, in her Manhattan apartment.
He was placed on the FBI's Top Ten Most Wanted list. The same year, two children at the camp saw the FBI's Wanted poster and told the camp's staff about it.
In 1978, in spite of his criminal record, Alcala was admitted as "Bachelor No. The host introduced him as a successful professional photographer.
Though Alcala won the contest, the female contestant wouldn't go on a date with him because she thought he was "creepy".