The Hollywood Ripper trial begins nearly 28 years after the murder of Tricia Pacaccio. Michael Gargiulo is on trial for the murders of Ashley Ellerin and Maria Bruno, as well as the attempted murder of Michelle Murphy. Due to California law allowing "prior bad acts" evidence to be introduced, prosecutors also detail the murder of Tricia Pacaccio to show a pattern of behavior and the eerie similarities between each of the attacks. Michelle Murphy, the lone survivor, also testifies at the trial. We speak to detectives who worked on the case, plus former L.A. County Deputy District Attorney Joshua Ritter about key aspects of the trial, and the most impactful witnesses in the attack on Michelle Murphy, and the murder of Tricia Pacaccio.