He shot JD Tippet. He tried to kill Dallas police officers when they apprehended him in the Texas theater, hense the black eye. We can also add in that the rifle found in the place he worked in was also his. Ballistics matched the Connelly bullet with the General Walker bullet. He did it. I think he had support to try to escape, but Tippet screwed that up. Ruby was an anomaly.
dont forget the “magic bullet”