Steve Stephens has killed at least 1 person, which he filmed and uploaded to Facebook, and claims to have killed 13.
There are some videos uploaded, one of which is very graphic, of him during the spree. In 1 of the video's he claims to have killed 13 people.
He's still at large.
CNN covering the story:
https://www.youtube.com/watch?v=I06BtdB6MdA