Retired SFPD Sergeant Suspected in Marin Murder-Suicide

She got out of the house on Strawberry Circle and called 911. The surviving daughter had been inside when the shots were fired. She left safely and reported the gunfire herself. The shots-fired call reached Marin County dispatch at 5:03 p.m. on Sunday, Oct. 11, 2026. The address was a residence in unincorporated Mill Valley, in the Strawberry community of Marin County.

Deputies from the Marin County Sheriff’s Office arrived within minutes and made safe contact with the caller outside. Family members cried out that evening after learning three people had been found dead inside. The first moves were containment, then the choice to go through the door.

“Our deputies made a small perimeter around the home, and decided to make safe entry into the home,” Miguel Almaguer of the Marin County Sheriff’s Office said. They went in to make sure no threat remained. Inside, the deputies found three people dead.

At a news conference at the scene that night, Almaguer described the find. “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,” he said. He gave no specifics on the circumstances around the shooting. The victims’ families had been notified. The coroner’s office would release the names. The investigation, he made clear, was only beginning.

“There is no threat to the community,” Almaguer said. Property records showed the home on Strawberry Circle was owned by two former officers of the San Francisco Police Department. Investigators shared no information about what had led up to the shooting and offered no motive. They held outside that night. A judge would have to sign a search warrant before they went back in for a fuller examination of the interior. Authorities confirmed there had been no previous calls for service at the address.

Sources identified the suspected shooter as Kevin Mannix, 68, a retired San Francisco Police Department sergeant. Those sources said he shot and killed his wife, retired Deputy Chief Ann Elizabeth Corriea Mannix, 65, and their daughter Katherine Elizabeth Mannix, known as Katie, 24, before turning the gun on himself.

San Francisco Police Chief Derrick Lew told the department that same evening. “It is with heavy hearts that we share the news of the passing of Ann and Kevin Mannix. Please keep their family in your prayers. BSU is available to all members who may need it during this difficult time,” Lew wrote in an internal notice.

The San Francisco Police Officers Association named all three dead: Kevin Mannix, Ann Mannix, and Katie. Friends of the family confirmed the deaths as well. Official identification still moved through the Marin County coroner’s office. The sheriff’s office continued to treat the nature of the victims and their connection to one another as part of the active investigation.

Ann Mannix joined the San Francisco Police Department in 1986. She retired in 2021 as a deputy chief, the department’s highest-ranking woman at the time. She became the first woman to command Northern Station. The San Francisco Police Officers Association, in a statement from President Louis Wong, laid out the firsts that defined the rest of her climb. “Ann Mannix was a trailblazer in our department - becoming the first woman to join and lead the SWAT team, and rising to lead both the Field Operations and Special Operations Bureaus.” SWAT is the department’s specialized tactical team for high-risk operations. She also led the tactical unit and the traffic company before taking over those two bureaus as deputy chief.

She was a fourth-generation San Franciscan from the Jordan Park neighborhood and had gone to public school in the Richmond District. She earned a political science degree from Loyola Marymount University on a basketball scholarship. Her first decade on the job was spent on patrol at the Park and Bayview stations. From there the specialized commands followed, and she stayed with the department until 2021.

The same department that carried her through those ranks had also held another long career under the same roof. Kevin Mannix put in 27 years of service with the San Francisco Police Department. He retired in June 2018 from Taraval Station after years spent on the Taraval captain’s staff. That assignment placed him with city supervisors, with community groups, and with the neighborhood events the station helped organize, work recorded in a 2016 post on a Taraval community website. When the career ended, Taraval Station held a retirees luncheon in his honor the same month he left the force.

In the letter he wrote then to Taraval Police Station he set down the life he expected next and the part of the job he refused to leave behind. “I am looking forward to a new life of leisure with family and friends. But I am a little saddened by the thought of not seeing all of you every day or at community events... I will miss you all. Believe me, that is not a trite generalization... I leave the SFPD, but I am taking your friendships with me forever.”

The San Francisco Police Officers Association said the suspected murder-suicide had left the entire SFPD family reeling. President Louis Wong spoke for the membership that had known both careers. “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 said. “To see their lives, and the life of their 24-year-old daughter Katie, end in such a horrific and senseless manner is a burden that weighs heavily on every officer, active and retired.”

The association noted that many had worked alongside Kevin during his 27 years of dedicated service at Taraval Station and beyond. The Marin County investigation remained in its early stages. No motive was released. That night on Strawberry Circle, deputies held the perimeter while investigators waited for a judge to sign the search warrant that would allow a fuller examination inside the home.