Medical staff at the county jail in Rancho Cucamonga became concerned about the condition of a male inmate on Wednesday, Oct. 6.

American Medical Response took him to Arrowhead Regional Medical Center in Fontana. His condition deteriorated. He was pronounced dead on Sunday, Oct. 16.

Investigators from the Sheriff’s Specialized Investigations Division investigating. 

Anyone with information or anyone who may have witnessed the incident is asked to contact Detective Tony Romero, Specialized Investigations Division, at (909) 387-3589. Callers can remain anonymous and contact WeTip at 800-78CRIME or wetip.com.