Press conference reveals details about how DNA from Orange County killings helped lead to an arrest of Golden State KillerOrange County killings helped lead to an arrest of Golden State Killer

SANTA ANA, CA - APRIL 25: Retired Orange County Sheriff’s homicide investigator Larry Pool, right, answers a reporters questions during a press conference at the Orange County Sheriff's Department in Santa Ana on Wednesday, April 25, 2018 to discuss the arrest of Joseph James DeAngelo, 72, in connection with homicides in Dana Point and Irvine in the 1980's. James Christian, at left, is now the current investigator on the case. (Photo by Leonard Ortiz/Orange County Register via Getty Images)