Skip to main content
An official website of the Jefferson County Sheriff's Office, Colorado Here's how you know

Official websites use .gov A .gov website belongs to an official government organization in the United States. The official website of the Jefferson County Sheriff's Office is www.jeffcosheriffco.gov.

Secure .gov websites use HTTPS A lock (locked padlock icon) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Press Releases

In-Custody Death

Press Releases

In-Custody Death

Jefferson County, CO. – Just after 4:15 a.m. on May 13, 2026, during routine cell checks, a deputy found inmate Jolene Dorothea Mathiesen unresponsive in her bunk. CPR was initiated and Narcan was administered by deputies and responding medical staff. Golden Fire and EMS arrived and continued lifesaving efforts which were unsuccessful. Mathiesen was pronounced deceased at 4:56 a.m.

Mathiesen (dob 12/4/80) was brought to the Jefferson County Detention Facility on May 11 by the Lakewood Police Department for a probation violation related to child abuse charges. 

The First Judicial District Critical Incident Response Team (CIRT) is conducting the investigation. The Coroner’s Office will determine the cause of death.