Inmate Serving Life Confesses Three Cold-Case Gang Murders California

Glenn Cox, a 39-year-old inmate serving multiple life sentences at Avenal State Prison for murder and attempted murder, has been arrested for three additional gang-related killings in Long Beach dating from 2004 to 2007. Cox confessed to these crimes in December 2023 while in prison, leading to further investigation by Long Beach police, who found corroborating evidence supporting his confessions. The cases include a 2004 shooting that killed Carlos Serrano and Jermy Kershaw, a 2007 shooting that killed Dino Marks, and an August 2007 shooting that wounded a man on a bicycle. Cox was booked on multiple counts including three for murder, three for attempted murder, and two firearm possession charges. These cases have been forwarded to the Los Angeles County District Attorney’s Office for consideration of prosecution. Authorities emphasized that all these shootings were gang-related and represent closure for victims’ families after nearly two decades.