Hours earlier, Painer had shot Simpson and her new boyfriend Seth Richardson at her home in Ponder, Texas, then turned the gun on himself.
During one of the videos, a tearful Simpson picks up a framed picture of her three slain kids and says, "Think about them".
The injured woman was taken to the hospital of the city of Denton.
Many said they were shocked as word quickly spread up and down the street about what had happened inside the home.
Simpson explained: 'I made it very clear to the judge that he was mentally unstable.
The five people were found dead inside a Denton County home Wednesday morning. "You guys know they were my everything, my goal to breath", Simpson said.
The grieving mother went on to say that she was "extremely mad" with the judge who handled their divorce, as she warned that Painter was "mentally unstable" after he attempted suicide a year ago.
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Amanda Simpson, 29, spoke after the terrifying murder-suicide in a Facebook Live video, as she continued to recover from a gunshot wound to her shoulder at the hospital.
"And they didn't listen, so now I don't have my babies". He stated that he didn't know her precise situation, however that he didn't consider that her accidents had been life-threatening.
Neighbors in the Denton County community gathered Wednesday night to pray for the family. I can confirm that we are not looking for the suspect at this time.
Simpson and Justin Painter married in 2012 and their divorce was finalized just two months ago.
"I have to start funeral arrangements", Simpson said, weeping.
She said Justin had been trying to get back together with her, but "I just couldn't".