Retired San Francisco police sergeant Kevin Mannix shot and killed his deputy chief wife and their 24-year-old daughter before taking his own life in Mill Valley.
Fox News reported that Marin County deputies responded to a 911 call around 5 p.m. Sunday at a family home on Strawberry Circle in the Bay Area coastal town. Another resident of the home escaped safely and placed the call. Deputies entered and found three family members dead inside.
Marin County Sheriff’s public information officer Miguel Almaguer said the preliminary investigation points to a suspected double-murder suicide. Authorities identified the suspected shooter as Kevin Mannix, 68, a retired San Francisco Police sergeant.
Almaguer told reporters the suspected shooter is male and declined to discuss any evidence found inside the residence. Autopsies for all three were scheduled for Tuesday.
The dead were identified as Ann Mannix, 65, a retired San Francisco deputy police chief; her daughter Katie Mannix, 24; and Kevin Mannix. Ann Mannix had been a trailblazing figure in the department. She was the first woman to join the SWAT team and later led it. She also served on the board of the city’s Police Activities League and backed youth sports.
"The preliminary investigation indicates a suspected double-murder suicide involving three individuals,"
Almaguer stated at a news briefing.
Friends described Ann Mannix as ready to move on. The New York Post reported that she had told a friend two weeks earlier she was divorcing Kevin and felt optimistic about what came next.
"She did tell me she was getting divorced, and it was the best thing and she was looking forward to the future,"
friend Hurabiell told the paper. Sources indicated the split hit Kevin hard and that he had been possessive.
Retired Capt. Alexa O’Brien, who knew the couple, contrasted their personalities. She called Kevin quiet and mild-mannered while describing Ann as the tougher of the two.
"He was very, I don’t know how to say it, but vanilla... If anybody was to look at a tough person, you’d look at Ann as the tough one,"
O’Brien said.
Former San Francisco officer and Bay Area columnist Lou Barberini, who knew Ann Mannix, praised her record and character in the wake of the deaths.
"Ann had a lot of talent, and she was very competent,"
Barberini said. He added that she was a great athlete, a good cop, and well-liked.
Louis Wong, president of the San Francisco Police Officers Association, issued a statement Monday expressing shock over the deaths that emerged from Marin County on Sunday evening.
"The tragic loss of retired Deputy Chief Ann Mannix, her daughter Katie, and retired Sergeant Kevin Mannix in a suspected murder-suicide has left our entire SFPD family reeling. There are no words that can fully capture the depth of this tragedy, nor are there simple answers to the painful questions we are all asking."
Wong noted Ann Mannix’s path as the first woman to join and later spearhead the SWAT team. San Francisco police did not immediately comment.
Mill Valley sits in Marin County across the Golden Gate from San Francisco, a quiet coastal enclave far from the streets where both Mannixes once worked. The home on Strawberry Circle became the scene of a family destruction that left no one to answer for the shots fired.
Cases of sudden household gunfire continue to surface in other corners of the country, including one in which elderly in-laws were arrested after a California shooting death.
Investigators have released no motive. Almaguer would not detail what deputies found inside. The 911 caller’s full identity beyond “another resident” has not been made public. Absolute calendar dates for the Sunday response and Monday statement were not listed in initial accounts.
What is clear is the sequence: a Sunday evening call, three bodies, a retired sergeant named as the shooter, and a marriage that friends say was ending. Katie Mannix, just 24, died alongside her parents.
Other recent violence has followed similar patterns of sudden loss, such as when a missing flight attendant’s body was found and a roommate faced a murder charge.
Wong’s statement framed the three deaths as a blow to the wider SFPD family. Ann Mannix’s colleagues remembered competence and toughness. Kevin Mannix’s colleagues remembered a quieter presence. None of those descriptions prevented the outcome inside the Mill Valley house.
Gunfire has torn through public events as well, with eight wounded in attacks around a New York parade in a separate outburst of street violence.
The Marin County Sheriff’s Office continues its work. Autopsies were set for Tuesday. No arrests were described because the suspected shooter was among the dead. Evidence details remain closed.
Large-scale enforcement actions against violent networks still move forward elsewhere, including when a federal grand jury charged 81 alleged members of a drug ring after a major sweep.
Ann Mannix built a career breaking barriers in a hard department. She raised a daughter and shared a home with a fellow retired officer. Two weeks before the shooting, she told a friend the divorce was the best thing and that she looked forward to the future. That future never arrived.
When private fractures meet firearms, the badge offers no shield and the coastal quiet offers no protection. Families pay the final bill.