Former San Francisco Police Sgt. Kevin Mannix shot and killed his wife and daughter before turning the gun on himself, sources say, leaving three dead in Marin County.

Marin County deputies responded just after 5 p.m. Sunday to reports of gunshots at a home in Strawberry, an unincorporated area near Mill Valley. Someone inside the house had called as the shots were fired.

Inside, they found three deceased bodies. Sources with intimate knowledge of the case told ABC7 that Mannix shot and killed his wife, former San Francisco Police Department Deputy Chief Ann Mannix, then their daughter, before turning the gun on himself.

Authorities said the public faced no ongoing threat. The Marin County Sheriff’s Office called the case an active investigation and declined to spell out the full circumstances.

Miguel Almaguer of the sheriff’s office put it in plain terms.

"Inside the home, they discovered three deceased bodies. The nature of those victims and their connection to one another are all part of our active investigations,"

Property records show the home belonged to the two former officers. At the scene, family members could be heard crying out after learning three people had been found dead.

Two high-ranking SFPD careers ended inside one house

Kevin Mannix had served as a San Francisco Police sergeant before retiring. Ann Mannix rose further. She became a deputy chief and built a trailblazing record inside a department long dominated by men.

A New York Post report identified Kevin as 68 and Ann as 65, and named their daughter Katie, listing her age as 24. ABC7 had described the daughter as 25. The Post account also filled in career detail that explained why the names carried weight across Bay Area law enforcement.

Ann was the first woman on the department’s SWAT team and the first to lead it, later reaching deputy chief. Colleagues remembered Kevin as quiet and mild-mannered, a contrast that made the alleged sequence of the shootings even harder for some to process.

Retired captain Alexa O’Brien drew that contrast directly.

"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."

Public rank does not settle private conflict. California has seen other spousal killings inside the home end in criminal charges and wrecked families, and this case landed with the same finality.

Marriage trouble stayed mostly out of view

A close family friend of Ann’s told the Post the couple’s marriage had been troubled. The friend said Ann had confided that the relationship struggled, though the pair was not estranged.

"We talked about her relationship with her husband. It wasn’t great."

That is the limited window outsiders now have into the household. No official motive has been released. The sheriff’s office has not confirmed weapon details, a formal manner-of-death ruling beyond the active probe, or a full timeline of the shots beyond the Sunday evening response.

Family violence cases keep surfacing in raw form across the country, including a son’s confession to shooting his mother in another jurisdiction, and each one leaves investigators sorting what neighbors and colleagues never saw.

In Marin County, deputies arrived after gunshots and a call from inside the home. They found three dead. Sources described a husband and father as the shooter who then killed himself. Officials would say only that the victims’ identities and connections remained part of the investigation.

Titles offered no protection at home

Ann Mannix’s career marked real ground inside the San Francisco Police Department. First woman on SWAT. First woman to lead it. Later a deputy chief. Kevin Mannix’s record was quieter, a retired sergeant colleagues cast as low-key.

None of that stopped three people from dying in their own house on a Sunday evening. Domestic collapse does not check the org chart first. Other recent cases have shown the same pattern from different angles, including a family shooting tied to in-law conflict in California that also left a household shattered in public view.

High-profile marriages fray in plain sight too, sometimes long before a crisis hits the blotter, as when a prominent Bay Area figure’s divorce filing preceded separate legal trouble. Here, a friend said the Mannix marriage “wasn’t great.” That confiding stayed private until the gunfire made privacy impossible.

Lawmakers and ethics panels often move slowly even when domestic allegations involve public officials, a dynamic visible when the House Ethics Committee stayed quiet on domestic violence claims in another case. Local investigators in Marin at least reached the scene the same evening and secured it.

They have said there is no threat to the public. They have not filled in the gaps the public most wants answered: exact sequence confirmed by forensics, any prior calls for service, and a stated reason, if one can ever be known, for why a former sergeant allegedly shot his wife and daughter before ending his own life.

Badges signal authority on the street. They do not guarantee peace at the dinner table, and they cannot reverse a night when three people in one family are carried out dead.