An inmate already serving multiple life sentences has been linked to three cold case killings in Long Beach dating back nearly two decades, authorities announced Friday.
Long Beach police said 39-year-old Glenn Cox was booked on Oct. 17 for three counts of murder, three counts of attempted murder and two counts of being a felon in possession of a firearm. Before this booking, Cox was already imprisoned at Avenal State Prison for a separate murder and attempted murder case.
Detectives said the breakthrough came after Cox confessed in December 2023 to multiple murders and an attempted murder while speaking with prison staff, who notified Long Beach police. In subsequent interviews, Cox provided details about three specific incidents in Long Beach, and investigators said they later found corroborating evidence linking him to those crimes.
The first incident occurred on Dec. 20, 2004, police said, when officers responded to the 100 block of East Pleasant Street and found four men shot. Two victims — 22-year-old Carlos Serrano and 23-year-old Jermy Kershaw, both of Long Beach — died, while two others survived.
On Feb. 16, 2007, officers discovered 31-year-old Dino Marks dead from gunshot wounds on the 1700 block of Cherry Avenue. Later that year, on Aug. 26, 2007, a man riding a bicycle on East Pacific Coast Highway was shot but survived.
Police believe the incidents were gang-related.
Detectives have presented the new cases to the Los Angeles County District Attorney’s Office for filing consideration.
Luis Zuniga contributed to this report.
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