The man accused of decapitating his father in their home northeast of Philadelphia and posting a video of the severed head online first shot him with a gun he bought the previous day, the county prosecutor said Friday. Bucks County District Attorney Jennifer Schorn said at news conference in Doylestown that Justin D. Mohn had a “clear mind” when he allegedly killed his father Tuesday before driving about two hours to a Pennsylvania National Guard training center where he was found with a handgun and arrested. An autopsy showed the man's father, Michael Mohn, had been shot ...