I took time to look into this further. There's little information out there, mostly I just found this tweet.
So we know this actually occurred where you said it did.
Next I decided to pull up the Austin Police Departments incidents file which is public record.
What I found in the file was horrifying.
Michael Mixerr... not only did you stand there giggling and filming someone's last moments as they probably died in terror and anguish, but it wasn't even an accident.
It was a murder. I can't find any details because its an open investigation I would guess, but someone probably rammed that persons car, flipped it and killed them. I'm so disgusted by your behavior. RIP to that poor soul.
Mods please tag this thread as GORE / DEATH / NSFW / NSFL