Katie Mannix Death, Obituary: Daughter Reported Killed in Marin County Shooting in California

Katie Mannix was reportedly among three people who died following a shooting at a residence in Marin County, California, on Sunday, October 11, 2026. The incident occurred at a home on Strawberry Circle in the unincorporated Strawberry area near Mill Valley, prompting an investigation by the Marin County Sheriff’s Office.

According to local media reports citing sources familiar with the investigation, Katie was the youngest daughter of retired San Francisco Police Department sergeant Kevin Mannix and retired deputy chief Ann Mannix. Her parents were also reported among the three people found dead inside the residence. Authorities had not publicly confirmed all the victims’ identities in the initial reports.

The sheriff’s office received a 911 call shortly after 5 p.m. reporting gunfire inside the home. Deputies arrived within minutes and made contact with the person who had reported the incident, who had safely exited the property. After establishing a perimeter, deputies entered the residence and discovered three deceased individuals.

Local reports, citing law-enforcement radio communications and investigative sources, alleged that Kevin Mannix shot his wife and daughter before dying in a murder-suicide. However, the complete circumstances of the incident had not been officially detailed by authorities in the reports available at the time.

The tragedy has drawn attention to the Mannix family’s longstanding connection to San Francisco law enforcement. Kevin Mannix served for 27 years with the San Francisco Police Department before retiring as a sergeant at Taraval Station in June 2018. Ann Mannix retired in 2021 as a deputy chief after a career that included pioneering service in the department’s SWAT team and senior leadership responsibilities.

San Francisco Police Chief Derrick Lew reportedly informed department personnel of the deaths, expressing sorrow and asking colleagues to keep the family in their thoughts and prayers.

As investigators work to establish the full circumstances surrounding the deaths, Katie Mannix’s reported passing has added to the grief surrounding the incident. Further verified information about her life, personal background, and memorial arrangements was not available in the reports reviewed.

Disclaimer: This article is based on the information provided and local media reports dated October 12, 2026. The reported identities and allegations concerning the shooting should be treated cautiously until confirmed through official statements. No additional personal details or funeral arrangements have been assumed.