Decorated San Francisco police officer and her daughter killed by her husband in suspected murder-suicide So far, investigators haven’t determined why former police Sgt. Kevin Mannix killed his wife, Ann Mannix, a former deputy chief, and their 24-year-old daughter. Source: https://www.nbcnews.com/news/us-news/decorated-san-francisco-police-officer-daughter-killed-husband-suspect-rcna603180