A 24-year-old Escondido man was found unresponsive in his cell at the Vista Detention Facility and pronounced dead, authorities said Tuesday.
Deputies discovered Ronaldino Estrada at about 10:30 a.m. Monday, according to the San Diego County Sheriff's Department.
Medics took Estrada to a hospital, where he was pronounced dead.
He was in a cell with a cellmate, but there was no evidence of foul play, sheriff's officials said. Estrada was jailed on Friday after being arrested by sheriff's deputies on suspicion of DUI causing bodily injury.
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The San Diego County Medical Examiner's Office will perform an autopsy to determine Estrada's cause of death.