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A convicted killer already serving life in prison has confessed to three additional cold-case murders, finally delivering justice to families who waited over two decades for answers in gang-related violence that plagued Long Beach.
Story Highlights
- Glenn Cox, 39, confessed from prison to three unsolved murders spanning 2004-2007
- Long Beach Police corroborated his admissions, leading to formal charges in October 2025
- Cases involved gang-related violence that remained unsolved due to witness intimidation
- Families of victims Carlos Serrano, Jermy Kershaw, and Dino Marks finally receive closure
Inmate’s Confession Breaks Decades-Old Cases
Glenn Cox approached prison staff at Avenal State Prison in December 2023 to confess his involvement in three cold-case murders that occurred between 2004 and 2007. The 39-year-old inmate, already serving multiple life sentences for murder and attempted murder, provided details that investigators later corroborated through their investigation. His voluntary admission triggered a comprehensive review by Long Beach Police Department detectives, who had suspected gang involvement in these cases but lacked sufficient evidence for prosecution.
Gang Violence Claims Multiple Victims
Cox’s confessions involve three separate incidents that terrorized Long Beach neighborhoods. On December 20, 2004, Carlos Serrano and Jermy Kershaw were killed in a double homicide on East Pleasant Street. Nearly three years later, on February 16, 2007, Dino Marks was shot and killed on Cherry Avenue. Additional shootings occurred on East Pacific Coast Highway in August 2007, where one man was wounded but survived the attack.
Law Enforcement Validates Prison Intelligence
Long Beach Police Department investigators spent months corroborating Cox’s confessions through evidence review and witness interviews. The department’s ability to validate the inmate’s admissions demonstrates the value of prison intelligence in solving cold cases. On October 17, 2025, Cox was formally arrested and booked for three additional murders, three attempted murders, and two firearm charges. The Los Angeles County District Attorney’s Office is now reviewing the cases for potential prosecution, though Cox already faces life sentences.
Families Find Closure After Years of Uncertainty
The breakthrough provides long-awaited closure to victims’ families who endured years of uncertainty about their loved ones’ killers. Gang-related violence in early 2000s Long Beach often went unsolved due to witness intimidation and community distrust of law enforcement. Cox was initially convicted in 2008 for the murder of Jonathan Fernandez, but these additional confessions reveal the extent of his criminal activity during that violent period. The resolution of these cold cases showcases how persistent police work and prison cooperation can deliver justice even decades after crimes occur.
Sources:
Incarcerated person linked to Long Beach cold case killings
Convicted killer confesses to 3 cold-case gang murders, LBPD says
Long Beach police arrest suspect linked to three cold-case murders