On July 5, 1978, Harris and his younger brother commandeered a car occupied by two 16-year-old boys, John Mayeski and Michael Baker, ordered them to drive to a remote area, then killed them. The brothers then used the car as their getaway car when they robbed a bank in San Diego. He was arrested less than an hour after the robbery and charged with murder, auto theft, kidnapping, burglary, and bank robbery. One of the arresting officers, Steve Baker, was the father of one of the murdered boys, but did not realize the victim was his son until later. Harris was convicted and sentenced to death on March 6, 1979. After a series of appeals and stays of execution, he was executed in San Quentin's gas chamber on April 21, 1992.