The facts surrounding this story were covered here at the time it happened.

Aside from the fact that the perp, the deceased Mr. DuBose was arrested close to 90x, and had Felony Possession of a controlled substance on this stop, this for all intents and purposes explains his attempt to flee, resulting in the dragging of an officer in his 3000+lb steel automotive weapon (ie Car) for which he was shot..the story was well covered.