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SBSD - Headquarters
Monday May 22nd, 2023 :: 09:18 a.m. PDT


Inmate at West Valley Detention Center Booked for Murder of His Cellmate

DATE/TIME: May 21, 2023, 4:54 a.m.

INCIDENT: Homicide Investigation

LOCATION: West Valley Detention Center - 9500 Etiwanda Ave, Rancho Cucamonga

SUSPECT(S): Marco Antonio Lopez-Hernandez, 26-year-old Male, Resident of Upland

VICTIM(S): Adam Adams, 56-year-old Male, Resident of Upland

SUMMARY: On Sunday, May 21, 2023, at approximately 4:54 a.m., a deputy assigned to West Valley Detention Center located 56-year-old inmate, Adam Adams, lying on the floor inside his cell. The deputy attempted to wake Adams and he was unresponsive. Deputies immediately began life-saving measures and requested jail medical staff to respond. Despite life-saving attempts, Adams was pronounced deceased.

Detectives with the Sheriff’s Specialized Investigations Division responded to conduct the investigation. During the investigation, it was determined Adam’s cellmate, Marco Antonio Lopez-Hernandez, was responsible for the death. Lopez-Hernandez was supplementally booked for PC 187-Murder.

Anyone with information about this case is asked to contact Deputy Charlie Lopez, Specialized Investigations Division at (909) 890-4904. Callers can remain anonymous and contact We-Tip at 800-78CRIME or

Refer: Deputy Charlie Lopez or Sergeant Jonathan Woods

Station: Specialized Investigations Division

Phone No. (909) 890-4904

Case No. DR#602300046 / H#2023-059

SHANNON D. DICUS, Sheriff-Coroner
San Bernardino County Sheriff-Coroner Department

SBSD - Headquarters
655 E 3rd St
San Bernardino, CA 92408

Emergency: 9-1-1
Non-emergencies: 909-387-3700

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