Former University of Arizona grad student Murad Dervish is on trial for the 2022 on-campus shooting and murder of professor Thomas Meixner.Patricia Grace, Dervish’s mother, took the stand to recount the voicemail her son left her the day of the shooting."Mom, I got to talk to you. I shot that guy. I hope he’s dead. I guess I have to kill myself now," Grace said, recounting the