LONG BEACH – Long Beach Police Department announced the arrest of a man tied to three cold case murders on Oct. 31.
On October 17, 2025, Homicide detectives arrested 39-year-old Glenn Cox for his involvement in three murders that took place between 2004 and 2007.
Suspect Cox, who is currently serving multiple life sentences at Avenal State Prison for a separate murder and attempted murder case, was booked for three additional counts of murder, three additional counts of attempted murder, and two additional counts of possession of a firearm by a person with a prior felony conviction.
In December 2023, suspect Cox confessed to multiple murders and an attempted murder to Avenal State Prison personnel, who then alerted LBPD detectives. Following further interviews with Cox, LBPD Homicide detectives additionally obtained confessions to the three incidents. They also discovered corroborating evidence, which furthered the investigation.
The incidents linked to Cox’s confessions include:
On Dec. 20, 2004, at approximately 11:15 p.m., officers responded to the 100 Block of East Pleasant Street to an unknown trouble call. Upon arrival, officers contacted four victims with gunshot wounds. A male adult victim was determined deceased at the scene. Three other male adult victims were transported to a local hospital, where one succumbed to his injuries and two others were treated for non-life-threatening injuries. The decedents were identified as Carlos Serrano, a 22-year-old resident of Long Beach, and Jermy Kershaw, a 23-year-old resident of Long Beach.
On Feb. 16, 2007, at approximately 12:05 a.m., officers responded to the 1700 Block of Cherry Avenue regarding a shots call. Upon arrival, officers contacted a male adult victim on the sidewalk with multiple gunshot wounds. The victim was determined deceased at the scene by Long Beach Fire. The decedent was identified as Dino Marks, a 31-year-old resident of Long Beach.
On Aug. 26, 2007, at approximately 3:54 p.m., officers responded to the 1000 Block of East Pacific Coast Highway regarding a shots call. Upon arrival, officers contacted a male adult victim with gunshot wounds to the lower body. Long Beach Fire personnel responded to the scene and transported the victim to a local hospital where he was treated for non-life-threatening injuries. The preliminary investigation indicated that the victim was on a bike when he was shot by a male adult suspect.
It is believed these incidents are gang related.
Detectives presented these additional cases to the Los Angeles County District Attorney’s Office for filing consideration.
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