Texas Mom Murdered Her Girls on Husband's Birthday Police shot Christy Sheats before she could fire at her daughter again, they say By Kate Seamons, Newser Staff Posted Jun 27, 2016 7:00 AM CDT 285 comments Comments Christy Sheats. (Facebook) (Newser) – "We're still trying to put the pieces together," said Fort Bend County Sheriff Troy Nehls in the aftermath of a Friday shooting that left a Texas mother and her two daughters dead. Among the details trickling out: A sheriff's rep tells People that Christy Sheats, who shot and killed daughters Taylor, 22, and Madison, 17, before being shot and killed by police, had a history of mental illness. Police had visited the home "for previous altercations" related to Sheats' "mental crisis," says the rep. A neighbor tells KTRK the Friday shooting occurred on the birthday of Jason Sheats, father of the daughters. The couple had been estranged, and had recently gotten back together, per the neighbor. He was present, but uninjured. While no motive has been given, "It was a family argument that turned into a shooting," Nehls said, per the Houston Chronicle. Another neighbor tells KTRK that Taylor collapsed after running out of the home; Madison and Jason fled, too. The neighbor reports seeing Christy exit the home with a gun, reenter to allegedly reload, and then emerge and shoot Madison in the back. The rep also tells People a Fulshear city police officer fired at Christy "before she was able to shoot [Madison] again." People flags this September Facebook post by Sheats: "Happy Daughter's Day to my two amazing, sweet, kind, beautiful, intelligent girls. I love and treasure you both more than you could ever possibly know."