Shortly before Christy Sheats shot and killed her two daughters on June 24, her husband had told her he was filing for divorce, according to police.
Jason Sheats told investigators he'd been out of the house with one of his daughters on the day of the shootings, People reports. When he came home, he found Christy sitting in the backyard of the family home in Katy, Texas, and that's when he told her of his decision to divorce her.
"This would be the last birthday that you are going to ruin," Fort Bend County Sheriff Troy Nehls told People, paraphrasing what Jason had told his wife. The incident occurred on his 45th birthday.
Shortly after receiving the news, Christy called a family meeting, which Jason assumed would be about the divorce. He did not anticipate what happened next.
"She immediately pulled the weapon out and pointed it at Mr. Sheats and wanted to blame him," Nehls said, adding that Christy told her husband, "You made me do this."
Christy shot their two daughters, killing them both, and was then fatally shot by police outside the family's home.
Police have a theory about why Christy didn't shoot her husband.
"Mr. Sheats stated that Christy knew how much he loved Taylor and Madison and how much they loved him," Nehls said, according to the Christian Post. "By killing his children, Mr. Sheats will have to live the rest of his life with this horrible memory."
The family was having issues in the days leading up to the shooting. Christy had gotten into a heated argument with her 22-year-old daughter, Taylor, who was due to be married in a few days.
"Christy wanted to ground her and prevent her from seeing her boyfriend, or fiance, because she argued with her," Nehls explained. "Mr. Sheats did not agree, and told her it was inappropriate to ground their 22-year-old daughter and prevent her from seeing her fiance."
Since the shooting, details have emerged regarding Christy's mental health problems.
She had reportedly been treated at a mental health facility on three occasions after attempting to take her own life. She was taking a number of medications and seeing a therapist to deal with her depression.
Jason also revealed to police his wife had a drinking problem and that they had separated multiple times throughout their decades-long marriage.
A funeral for Taylor and Madison was planned for July 2, according to the Christian Post.