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.
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.
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.
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 confessed to knowing Hover, but denied committing the murder.
Alcala was born Rodrigo Jacques Alcala Buquor in Texas in 1943. After he suffered a nervous breakdown, he was medically discharged when the military psychiatrist diagnosed him with antisocial personality disorder.
His father, Raoul Alcala Buquor, abandoned the family when he was young. In 1968, he graduated from the UCLA School of Fine Arts with a Bachelor of Fine Arts degree and later studied film under Roman Polanski (whose wife would later become a victim of the Manson Family) at the New York University under the name "John Berger".
When he was 12, he, his mother Anna Maria Gutierrez, and his sisters, Christine and Marie, had moved to suburban Los Angeles. In the summer, he worked as a counselor at a drama camp for children in New Hampshire.
Alcala's first known victim was an eight-year-old girl named Tali Shapiro, whom he abducted as she was on her way to school.