Woman killed by cops after fatally shooting her own kids was staunch pro-gun advocate

It was a horrific scene at a family birthday party as a mom fatally shot her two daughters before she was gunned down by police.

Read: Texas Mom Fatally Shoots Her Young Daughters Before Police Are Forced to Take Her Down: Cops

The tragedy unfolded in an affluent neighborhood near Houston as 42-year-old Christy Sheats exploded with rage, firing at her daughters Madison, 17, and Taylor, 22, as they fled into the street.

Her husband could be heard pleading: "Don't do this! They're our kids!"

Police radio traffic captured the drama.

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The dispatcher was recorded saying: "There is a subject on location standing over one of the patients that has been shot. She has a gun. The subject went back into the residence apparently to get more ammunition."

An officer then told dispatch: "Shots fired! I shot the subject."

Fatalities from Gun Violence by State in 2015 InsideGov

Christy Sheats had a history of mental problems and had only recently reunited with her estranged husband after a separation. The family was celebrating his 45th birthday when she had what authorities called a "mental crisis."

Read: Former JonBenet Ramsey Murder Suspect Charged in Colorado Child Porn Case

Psychologist Dr. Jeff Gardere says filicide, killing your own children, is one of the most shocking crimes of all.

"This is something that is absolutely shocking and therefore, this isn't just about someone losing her temper and then killing her daughters. There is something much, much deeper going on," Dr. Gardere said. "You have to ask yourself, 'How could this go so wrong?'"

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Sheats reportedly owned several guns and recently posted a anti-gun control message on her Facebook page vowing never to give them up.

"It would be horribly tragic if my ability to protect myself or my family were to be taken away," she wrote on her Facebook page in March. "That's exactly what Democrats are determined to do by banning semi-automatic handguns."

See images from the scene: