Jonathan Buck, age 32, was found dead, locked inside a small shack in the middle of the woods. The cause of death was a single gunshot to the forehead from several meters away. The victim's death was likely instantaneous. No firearm was found inside the shack. The shack has one door, no windows save for glass panes in the door, and no other discernible entry points. The door can only be locked from the inside, and shows no signs of having been tampered with.

(Figured you can't go wrong with a classic locked room mystery. Have fun!)

Question: What happens if you've done something so abhorrent that even Satan can't approve? I dunno what this could be, but this might lead to a "not guilty" verdict because the prosecution's entire premise falls apart.