The Tarrant County Medical Examiner's Office identified two of the dead as Justin Painter, 39, of Fort Worth and Seth Richardson, 29, of Lancaster, South Carolina.
Police surround the home in Ponder, Texas, where five people were found dead on May 16, 2018. "Had I known the man was going to go in there and do that, I would have stopped".
In her Facebook post, Simpson said she had been shot and was likely facing more surgeries.
The Ponder Volunteer Fire Department says they were called out to a home on Wednesday morning for a self-inflicted gunshot victim.
News of the murder-suicide shocked residents of the suburban town with a population of less than 1,400 people.
A automobile is towed as Denton County Sheriff's officers examine the crime scene.
Fire officials in Ponder, 30 miles (50 km) north of Fort Worth, told NBC 5 that five people were found dead inside the home and the shooter was among the dead. The female survivor's condition is unknown at this time.
Superintendent Bruce Yeager said in a statement that the address where the shooting took place doesn't come up in the district's system as belonging to any students or staff members.
"It's sad", neighbor Mark Downing said Wednesday.