Neighbors remember shooting spree victim as 'greatest guy in the world' David Liebler was found dead in his truck after police say he was shot in the neck by 19-year-old Ashin Tricarico. and last updated 2021-06-23 20:15:29-04 PEORIA, AZ â Neighbors and friends are mourning the loss of David Liebler this week. Peoria police identified the 67-year-old from Sun City as the lone person who passed away last Thursday, following a shooting spree that spanned the Northwest Valley, lasted nearly two hours, and injured 13 people, including children. Liebler was found dead in his truck after police say he was shot in the neck by 19-year-old Ashin Tricarico. The father was just a mile and a half away from his Sun City home when he was shot.