He technically didn't kill anyone canonically, but it can make sense that he can actually murder someone and get the ``Ultimate Punishment`` via Smashronpa.
Still, I think he'd just be the trial 3 murderer. As in he'd kill someone for a very wholesome reason.
Ultimate Punishment. About to be hanged. Soon the arrows fly and try to cut the rope off, but they just miss and get shot through flesh again and again until it finally hits the rope, and then a fire is placed underneath.