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 co

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