Unusual suspects

Okay, we have six prime suspects with their weapons of choice:

- Captain Hook with his sword

- Blacktron Leader with his laser pistol

- Jeremy Hillary Boob, PhD with his silenced machine pistol

- Bob with his lightning staff

- Iron-fist with his rusty pickax

- Sheldon J. Plankton with his Colt revolver

 

Now the question is this... which one of the fellows, slashed, fried twice, shot three times, infected with tetanus, and bludgeoned the deceased?!?

Done