A 22-year-old man was found unresponsive at the St. Croix County Jail on Monday morning.

Jail staff found the man unresponsive in the Huber dorm section of the jail around 6:30 a.m. and immediately started life-saving measures.

Lakeview EMS was called to help, but the man was pronounced dead inside the jail by the St. Croix County Medical Examiner.

The St. Croix County Sheriff’s Office says it is standard policy to bring in an outside agency for an independent investigation after any serious incident, including an inmate death.

The Dunn County Sheriff’s Office was notified and responded to the jail to take over the investigation.