DALLAS (AP) — A former star football recruit whose receiving skills once brought him prominence at Texas A&M randomly attacked a jogger, using a "large-bladed knife" to repeatedly strike the man and lodging the weapon in his head, according to police documents. A bicyclist told police he saw the attacker repeatedly striking the jogger in the head, an arrest warrant affidavit revealed Tuesday. The affidavit says Johnson then approached a nearby man, asked to use his cellphone and called 911 to say the victim "was laying down with a sword in his head and not moving." Johnson stayed at the scene and spoke with a responding officer, twice saying, "I just committed capital murder," according to the affidavit. Records show he had multiple violations of the terms of his probation, including for testing positive for marijuana and failing to complete community service.