A retired San Francisco police sergeant is suspected of killing his estranged wife, a former deputy police chief, and their 24-year-old daughter before taking his own life in Marin County, California.
The victims were identified as Ann Mannix, 65, and her daughter, Katherine Mannix, 24. Ann’s estranged husband, Kevin Mannix, 68, was identified as the suspected shooter in the incident, which occurred on Sunday, October 11, 2026.
According to CBS News Bay Area, authorities responded to a home on Strawberry Circle in the Strawberry community near Mill Valley at approximately 5 p.m. following reports of the incident.
The deaths have drawn attention to Ann’s distinguished career with the San Francisco Police Department (SFPD), where she reportedly made history as the first woman to join and lead its SWAT team.
She later rose through the department’s ranks to become a deputy chief, serving in a demanding law enforcement profession over the course of her career.
Her death has therefore marked a tragic end to the life of a woman who broke barriers in policing and held senior leadership responsibilities within the department.
Katherine, 24, was reportedly studying to become a nurse. Her death has added to the heartbreak surrounding the incident, cutting short the young woman’s future plans.
Preliminary findings by investigators reportedly pointed to a double murder-suicide. Authorities are continuing to establish the full circumstances surrounding the deaths, while post-mortem examinations were scheduled to help determine the precise causes of death.
Although the couple were reportedly estranged, further details about their relationship and what may have preceded the incident have not been established in the available reporting. There is also no verified information in the cited report confirming earlier threats or domestic violence allegations.
The case has renewed attention on the devastating consequences of suspected domestic violence and the importance of evidence-based investigations into deaths involving family members.
As investigators work to clarify what happened inside the home, Ann and Katherine’s lives remain central to the tragedy: one remembered for her pioneering service in law enforcement, the other for her aspirations to become a nurse.
The investigation continues, and further official findings are expected to provide greater clarity about the events that led to the deaths.
Credit: CBS News Bay Area
