Santa Barbara County officials launched Monday an investigation into the death of a man held in custody at the Northern Branch Jail in Santa Maria, according to the sheriff’s office.

Prison and medical staff found the unidentified man in his cell at around 2:19 p.m. while doing medical rounds in one of the jails, according to a statement released Monday. The man was unresponsive and not breathing.

Prison officials administered two rounds of Narcan, a nasal spray that reverses an overdose, performed CPR and used an automated external defibrillator.

or AED,

a device used to ease heart attacks. Additional medical staff were called to the prison, “but the deceased did not recover and was pronounced dead at 2:46 p.m. without having been transported,” the statement said.

Officials are not releasing the person’s name until they can contact his family.

The sheriff’s office and coroner’s office have launched an investigation

into death

.