A 32-year-old Antioch man has been missing since Wednesday night.
Simmons was last seen in Antioch on Wednesday.
The search now spans three counties. As reported by
KRON4
, the California Highway Patrol issued an Endangered Missing Advisory for Simmons, describing him as roughly 5 feet 6 inches tall, about 110 pounds, with black hair and brown eyes.
A Search That Jumped From Antioch to SoMa
Simmons was last seen around 8:20 p.m. Wednesday near Bellflower Drive and Baywood Circle, a residential stretch in southern Antioch, per the same KRON4 report. The CHP activated its advisory across Contra Costa, Alameda, and San Francisco counties.
The CHP believes Simmons may be traveling on foot, KRON4 reported.
What Happens Once a Case Crosses County Lines
Endangered Missing Advisories like the one issued for Simmons exist under a specific legal framework. California Government Code Section 8594.11 and Assembly Bill 946 authorize regional alerts when a missing person is developmentally disabled or cognitively impaired and disappears under unexplained or suspicious circumstances, according to guidance published by the California Highway Patrol. Those advisories also help the state meet federal Ashanti Alert Act guidelines.
Once the vehicle surfaced in San Francisco, the case also triggered specific obligations for local police there. Under San Francisco Police Department General Order 6.10, updated in March 2025, missing adults with developmental disabilities or cognitive impairments are automatically classified as at-risk. The order’s initial-investigation checklist directs officers to check the County Jail or Juvenile Justice Center, hospitals, and the Medical Examiner’s Office. Its immediate and continuous search rule applies to a dependent adult or a person who lacks the cognitive abilities to care for themselves, according to the department’s policy document published by the City and County of San Francisco.
Open Questions Remain
Several details of the case remain unresolved. It is not yet known who the family member traveling with Simmons was or that person’s current status, whether investigators have reviewed security footage in the SoMa area, or whether Simmons was seen boarding or exiting BART or another transit line. Anyone who sees Simmons should call 911 immediately.
In August 2025, Antioch Police issued a public appeal after 73-year-old Walter Crua went missing on foot from an Antioch neighborhood.
