A retired San Francisco police sergeant is suspected of killing his wife and their 24-year-old daughter before taking his own life at the family’s home in unincorporated Mill Valley, Marin County authorities said Monday. The Sheriff’s Office identified the three people found dead as Kevin M. Mannix, 68; his wife, Ann Elizabeth Corriea Mannix, 65; and their daughter, Katherine Elizabeth Mannix, 24. The preliminary investigation indicates a suspected double homicide followed by suicide, sheriff’s spokesperson Miguel Almaguer said. Deputies responded shortly after 5 p.m. Sunday to a 911 call reporting shots fired at a home on a small street where the Mannix family owned a residence. The caller had been inside the home and made it outside before deputies arrived, Almaguer said. Deputies entered and found three people dead. Police radio communications reviewed by local reporters included a caller’s account that the father had shot the mother and sister. The communications described between six and nine shots from a handgun and identified Kevin Mannix as the suspected shooter. Authorities have not publicly released further details about the circumstances. Kevin Mannix retired as a sergeant in 2018 after serving with the San Francisco Police Department, including at Taraval Station. Ann Mannix retired in 2021 as a deputy chief overseeing special operations. She was the first woman to join the department’s SWAT team and later its first woman to lead the unit; she was also the only woman to have served on the team, according to the department’s history cited in public records. SFPD Chief Derrick Lew informed department staff Sunday evening of the deaths of the two retired officers. The president of the San Francisco Police Officers Association called Ann Mannix a trailblazer and said many officers had worked alongside Kevin Mannix during his 27 years of service. Autopsies were scheduled for Tuesday. The sheriff’s investigation is ongoing. People experiencing emotional distress can call or text 988 for the Suicide & Crisis Lifeline. The National Domestic Violence Hotline is available at 800-799-7233 or by texting START to 88788.