On Wednesday, dash cam video from the Irving Police Department was released, showing the crash and arrest.
Police say the officer was grazed by his own motorcycle when 23-year-old Jordan Dunn hit it with his car and then tried to take off.
A Good Samaritan who was being given a speeding ticket by that officer jumped in to help. He followed Dunn, pulled him out of his car and then held him on the ground at knifepoint until police arrived.
Dunn says he was distracted by his phone when he hit the motorcycle and didn't stop because he was looking for a place to pull over.
He's being charged with deadly conduct.
The only part of this story we do not have is the identity of the man who was the subject of the original traffic stop.
He's 53 and lives in Corinth, but has not responded to any phone calls.