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SAN DIEGO —  An inmate was stricken by an apparent medical crisis at San Diego Central Jail and died of unknown causes around an hour later, authorities reported Friday.

A fellow inmate notified guards that 32-year-old Michael Richard Wilson had collapsed inside his housing cell around 8:15 a.m. Thursday, according to sheriff’s officials.

“Deputies responded to the cell and saw an inmate in apparent medical distress,” Lt. Michael Blevins said. “The man did not appear injured, but soon after deputies entered the cell to help the 32-year-old man, they noticed he was unresponsive.”

Paramedics took Wilson to a hospital, where he was pronounced dead. A cause-of-death ruling was on hold pending autopsy results.

Homicide detectives were called in to investigate the fatality, which is standard protocol in cases involving in-custody deaths.

“Our response is not an indication of foul play or suspicious circumstances,” Blevins said.