Deputies Respond to Man Behaving Erratically and Detain Him Before He Becomes Unresponsive 

August 9, 2025 – San Bernardino County Sheriff’s Department officials report that on Thursday, August 7, 2025, at 8:48 p.m., deputies in Highland were dispatched to a residence after the caller reported an unknown male acting erratically on his property.  When deputies arrived, they located a male subject, identified as Michael Mancilla, rolling on the ground.  Deputies detained Mancilla, placed him in handcuffs, and sat him up against a wall.  While Mancilla sat, he became unresponsive, and deputies began CPR until emergency medical personnel arrived.  Mancilla was transported to a local hospital and was pronounced deceased.  

The Sheriff’s Specialized Investigations Division responded and assumed the investigation. An autopsy will be conducted to determine the cause of death.  

Anyone with information regarding this case is urged to contact the Specialized Investigations Division at 909-890-4904.  Callers wishing to remain anonymous should contact We-Tip at 1-800-78-CRIME (27463) or go to www.wetip.com.

DATE:  August 7, 2025
INCIDENT: In-Custody Death Investigation
LOCATION: 7500 Block of Guthrie Street, Highland
DECEDENT: Michael Mancilla, 42-year-old Resident of Paramount, CA
Refer: Sergeant M. Warrick and Detective J. Rollins
Station: Specialized Investigations Division
Phone No. 909-890-4904
Case No. DR# 132502721  H# 2025-069

Source: San Bernardino County Sheriff’s Department