Retired San Francisco Police Sergeant Kevin Mannix Allegedly Kills Estranged Wife Ann Mannix and Daughter Katie, 24, in Marin County Murder-Suicide
MARIN COUNTY, CALIFORNIA — October 12, 2026: A tragic shooting in Marin County has left three members of a family dead after a retired San Francisco Police Department (SFPD) sergeant allegedly killed his estranged wife and their youngest daughter before taking his own life.
According to reports from the San Francisco Chronicle, Kevin Mannix, 68, a retired San Francisco police sergeant, is believed to have fatally shot his estranged wife, Ann Mannix, 65, a former SFPD deputy chief, and their 24-year-old daughter, Katie Mannix, on Sunday, October 11, 2026. Investigators are treating the incident as an apparent murder-suicide, although the circumstances remain under investigation.
What Happened in the Marin County Shooting?
The deadly incident occurred at a residence on Strawberry Circle in Strawberry, an unincorporated Marin County community near Mill Valley, California.
The Marin County Sheriff’s Office received a 911 call at approximately 5:03 p.m. Sunday, reporting gunfire inside the home. Deputies arrived within minutes and contacted the caller, who had safely escaped the residence.
After securing the surrounding area, officers entered the property and discovered three deceased individuals.
Sources familiar with the investigation subsequently identified the deceased as Kevin Mannix, Ann Mannix and their daughter Katie. Authorities have not publicly established what led to the violence.
The sheriff’s office confirmed that there was no known continuing threat to the surrounding community.
Who Were Kevin Mannix and Ann Mannix?
Kevin Mannix was a longtime member of the San Francisco Police Department who retired in June 2018 after approximately 27 years of service. He previously worked as a sergeant at the department’s Taraval Station.
His estranged wife, Ann Mannix, had an accomplished career in law enforcement, becoming the first woman to join and later lead the San Francisco Police Department’s SWAT team.
Ann subsequently served in senior leadership positions, including deputy chief, before retiring in 2021.
Their youngest daughter, Katie Mannix, was just 24 years old when the shooting occurred.
The deaths of the two retired police officers and their daughter have drawn attention throughout the Bay Area law enforcement community.
San Francisco Police Department Reacts to Family Tragedy
San Francisco Police Chief Derrick Lew informed department personnel of the deaths in an internal message Sunday night, expressing sadness over the loss of two former members of the department.
Lew also encouraged officers and employees affected by the tragedy to seek support through the department’s behavioral science unit.
The shooting has prompted renewed attention to domestic violence and the devastating consequences of family-related gun violence.
Marin County Murder-Suicide Investigation Continues
Investigators are working to determine the events surrounding the shooting, including the circumstances that preceded the deaths.
As of October 12, authorities had not publicly confirmed a motive or provided a complete account of the incident. The allegation that Kevin Mannix killed his wife and daughter before taking his own life is based on information provided to news outlets by sources familiar with the case.
The Marin County Sheriff’s Office is expected to release additional verified findings as the investigation progresses.
The deaths of Ann Mannix and Katie Mannix, alongside the suspected involvement of retired Sergeant Kevin Mannix, mark a devastating family tragedy that has deeply affected those connected to the San Francisco Police Department.