A 27-year-old inmate was found dead in his cell at Santa Clara County Main Jail in San Jose early Saturday morning, according to officials. The Santa Clara County Sheriff's Office reported that deputies discovered the unresponsive man around 4:13 a.m. during a routine check and hastily began lifesaving measures including CPR.

The San Jose Fire Department and Emergency Medical Services were called to the scene and arrived by 4:27 a.m., but the inmate was pronounced dead at 4:40 a.m., sheriff’s deputies said. As per KTVU, the man was alone in his cell when the incident occurred.

Preliminary findings by the sheriff’s office point to the absence of foul play as a cause of death. The deceased, who had been jailed since Oct. 20 on suspicion of attempted robbery, attempted burglary, and vandalism, would have his cause and manner of death determined by the Santa Clara County Medical Examiner-Coroner's Office. Until the notification of next of kin, the man's identity remains undisclosed.

The Sheriff's office is following standard procedure for an in-custody death by undertaking a joint investigation with the Santa Clara County District Attorney's Office and Medical Examiner-Coroner’s Office, according to a statement obtained by KRON4. Details on the man's time in custody and the circumstances leading to his death are still under investigation, as authorities work to unravel the events of that early morning.