His alleged killing spree in a suburb of Chicago, where in 1993 he allegedly killed 18-year-old Tricia Pacaccio. He then moved on to Santa Monica, California, where he lived when he murdered Ashley Ellerin, the girlfriend of actor Ashton Kutcher at the time. Gargiulo's alleged killing activity in the Los Angeles area ran from August 2001 to 2008. He was charged with killing Maria Bruno of El Monte, California, in 2005, and with the attempted murder of Michelle Murphy of Santa Monica who survived the attack. This led to Gargiulo's capture in 2008. He is currently[when?] held at Los Angeles County Jail awaiting trial.
Gargiulo was dubbed the "Chiller Killer" since he worked as an air-conditioning repairman in Los Angeles. He is also known as the "Hollywood Ripper"