Ann Mannix, a trailblazing former San Francisco deputy police chief, and her daughter were killed in an apparent murder-suicide involving Mannix’s husband, a retired police sergeant, according to the Marin County Sheriff’s Office.

Authorities identified the victims as Ann Mannix, 65, a former SWAT commander; her 24-year-old daughter, Katie; and her husband, 68-year-old retired San Francisco Police Sgt. Kevin Mannix.

“The preliminary investigation indicates a suspected double murder-suicide involving three individuals,” Miguel Almaguer, the Marin County Sheriff’s public information officer, said in a statement. “The suspected shooter is male.”

At a later news briefing, Almaguer identified Kevin Mannix as the suspected shooter and said he could not provide details about evidence recovered inside the home.

Deputies were dispatched to the family’s home in Mill Valley shortly after receiving a 911 call at about 5 p.m. Sunday.

The caller, described only as another resident of the home, reportedly escaped safely. Deputies entered the residence and found all three family members dead, authorities said.

Autopsies for the three victims were scheduled to take place Tuesday.

“It is with profound sadness, shock, and heavy hearts that we address the devastating news that emerged out of Marin County on Sunday evening,” San Francisco Police Officers Association President Louis Wong said Monday. “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 said Ann Mannix was the first woman to join the San Francisco Police Department’s SWAT team and later became its leader. She also supported youth sports for her children and other young people and served on the board of the city’s Police Activities League.

“Ann had a lot of talent, and she was very competent,” said Lou Barberini, a former San Francisco police officer and Bay Area columnist who knew the couple. “She was a great athlete, she was a good cop, and she was well-liked.”

The San Francisco Police Department did not immediately respond to a request for comment.