Death Investigation 

August 20, 2026 – San Diego County Sheriff's Office officials report that they are releasing information regarding the death of 34-year-old William Mondesi, who was in custody at the San Diego Central Jail (SDCJ). On Friday, August 14, 2026, Sheriff's Homicide investigators were notified that Mr. Mondesi had passed away at a local hospital.

On August 14, 2026, at approximately 7:20 p.m., a Sheriff's Deputy conducting a security check at SDCJ discovered Mr. Mondesi who was unresponsive inside his cell.  Mr. Mondesi was housed alone. The deputy immediately requested assistance from facility medical staff, activated 9‑1‑1, and began life‑saving measures.

Paramedics and personnel from the San Diego Fire Department continued resuscitation efforts upon arrival. Mr. Mondesi was transported to a local hospital, where he was pronounced deceased at approximately 8:05 p.m.

Mr. Mondesi had been arrested by the San Diego Police Department and booked into Sheriff's custody on August 13, 2026. He was facing several drug‑related charges, including possession of a controlled substance, transportation/sales of narcotics, and possession of drug paraphernalia.

Related: San Diego County Sheriff Reports Death Investigation Opened After 34-Year-Old Man Dies in Custody

The San Diego County Sheriff's Office extends our sympathies to the Mondesi family and all those affected by his passing. A Sheriff's Family Liaison Officer will continue to support the family during this difficult time.

The Citizens' Law Enforcement Review Board (CLERB) was notified of the incident. In accordance with protocol for all in‑custody deaths, the Sheriff's Homicide Unit responded and is conducting a thorough investigation to examine all aspects of the incident. The cause and manner of death will be determined by the Medical Examiner's Office.

Source: San Diego County Sheriff's Office