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FORT WORTH (CBSDFW.COM) – The day his brother died, David Harrison mopped his blood from their mother’s doorstep.

“I had to clean up the mess, I want to see how the mess got there, why the mess was there, how we got to that point,” he said.

This week, he and his mother filed a lawsuit against the officers who shot and killed Jason Harrison.

Jason was a bipolar schizophrenic, according to his family. That day, he refused to take his medication.

His mother dialed 911 for help. “And she regrets it because of the outcome,” said David.

When two police officers arrived, Jason came to the door holding a screwdriver.

Both officers say he lunged or jabbed at them, prompting them to shoot.

But, David doesn’t believe the officers’ description of his brother.

“That wasn’t one of his personalities in his whole life, to be aggressive, to try to assault someone with a weapon of any kind. That wasn’t him,” said David.

One of the officers was wearing a body camera, which police have said corroborates their story, but the video still hasn’t been released, not even to Jason’s family.

Police Chief David Brown said he and the district attorney’s office believe doing so could taint grand jury proceedings.

“We would like to get the truth as to how it really ended,” said David.

He and his mother hope their lawsuit finally gets them answers and sends a message to police.

“You don’t have a right to do whatever you feel like you need to do and not be held accountable for it,” said David.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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