A retired San Francisco police commander, her husband, and their 24-year-old daughter were found shot to death inside their Marin County home, and investigators say the husband turned the gun on himself after killing the other two.
Quick Take
- Retired San Francisco Police Department Sergeant Kevin Mannix, 68, is suspected of killing his wife and daughter before killing himself.
- Deputies found three bodies inside a home on Strawberry Circle in Marin County on October 11.
- The wife, Ann Mannix, 65, was a former San Francisco deputy police chief; their daughter, Katherine “Katie” Mannix, was 24.
- A friend says Ann Mannix had been planning to divorce her husband before the killings.
- Authorities have not released a motive and call the case a suspected double-murder suicide.
What Happened Inside the Strawberry Home
The Marin County Sheriff’s Office says dispatchers got a 911 call at 5:03 p.m. on October 11 reporting shots fired inside a home on Strawberry Circle, in the unincorporated waterfront community of Strawberry. Deputies arrived and found three people dead inside. Officials said there was no ongoing threat to the neighborhood once they searched the home.
The sheriff’s office later identified the three victims as Kevin Mannix, 68, his wife Ann Elizabeth Corriea Mannix, 65, and their daughter Katherine Elizabeth Mannix. Investigators labeled the case a suspected double-murder suicide and named Kevin Mannix as the suspected shooter. A person who called 911 during the shooting managed to get out of the house safely before deputies arrived.
Two Decorated Careers Inside the San Francisco Police Department
Both Kevin and Ann Mannix spent their careers in law enforcement. Kevin Mannix retired as a sergeant with the San Francisco Police Department. Ann Mannix rose further, serving as a deputy chief before her retirement, making her one of the department’s highest-ranking former female leaders. Their daughter, known to friends and the police union as Katie, was 24 years old and had no reported connection to law enforcement work.
Friends and colleagues who learned of the deaths described shock at the news, given the family’s standing in the San Francisco law enforcement community. The San Francisco Police Officers Association confirmed the identities of the two former officers to local media, a sign of how closely the department tracked the case even though the shooting happened outside city limits, in neighboring Marin County.
A Planned Divorce and an Unanswered Motive
A close friend of Ann Mannix told reporters that she had been planning to divorce her husband before the shooting. The friend’s account offers the only specific detail so far about tension inside the marriage leading up to the killings. Investigators have not confirmed a motive and say the case remains under investigation.
A trailblazing former San Francisco deputy police chief and her 24-year-old daughter were found dead inside their Mill Valley home Sunday evening in what authorities say was a double-murder suicide carried out by her husband, a retired SFPD sergeant.
Ann Mannix, 65, was the… pic.twitter.com/qnFA1ywazE
— Fox True Crime (@FoxTrueCrime) October 12, 2026
Public records show the couple had lived together in Strawberry for years in a home in a quiet, upscale waterfront neighborhood known more for its marina views than violent crime. Neighbors described the area as tight-knit, which made the scale of the loss, three members of one family, harder for the community to process in the days after the shooting.
A Pattern Researchers Have Long Tracked
Cases like this fit a pattern researchers have studied for years. More than half of intimate partner homicides in the United States involve a firearm, according to a review of studies tied to the Department of Justice. Access to a gun in a household with relationship conflict sharply raises the risk that a dispute ends in death rather than survival.
Domestic shootings often do not stay contained to one person. Researchers note that when a firearm is present during family conflict, the danger can extend to children, other relatives, and even neighbors who happen to be nearby. The Mannix case, with a daughter killed alongside her mother, reflects how these incidents frequently claim more than one victim at once.
What Comes Next
The Marin County Sheriff’s Office says its investigation is ongoing, though officials consider the immediate danger over since all three people involved are dead. No further details on a motive, the weapon used, or events inside the home in the hours before the shooting have been released publicly. Investigators have not said whether they expect to release additional findings.
Sources:
people.com, marinij.com, marinsheriff.gov, sfchronicle.com, justice.gov
