Criminal profiler Pat Brown later suggested that this rejection angered Alcala further since he afterwards killed at least three more women within two years.
Earlier on the day of Samsoe's disappearance, Alcala had been seen trying to get her and one of her friends to get into swimsuits so he could take pictures of them, but was chased away by a neighbor.
The previous day, he had tried to convince two teenage girls to do so by offering them marijuana.
He is also believed by investigators to be responsible for the 1977 murder of 19-year-old Pamela Jean Lambson in San Francisco, but isn't charged with it since there are no fingerprints or DNA evidence that implicates him.
120 of the photos found in Alcala's locker have been publicly released with the hopes that the subjects will come forward and identify themselves.
He was found guilty on all counts and is currently on death row in San Quentin State Prison.
In 2011, he was indicted for the New York murders of Cornelia Crilley and Ellen Hover and may be extradited to the state in the future.Alcala went on trial for Samsoe's murder and was found guilty and sentenced to death in 1980.The sentence was overturned twice, first in 1984 because the jury was told about his previous convictions before the trial and then again in 1986 on the grounds that a witness had been hypnotized.They reported Alcala to the authorities, leading to him being extradited to California.Because Shapiro's family had moved to Mexico and wouldn't let their daughter testify, Alcala got off with a guilty plead for a lesser assault charge.After he lured her into his car, a witness followed him back to his apartment on De Longpre Avenue and called the police.