This character assassinat
This character assassinates the Joker at the end of the Elseworlds comic Batman: Dark Allegiances.  After he is defeated in battle with Hellboy, this character's amnesiac brain is transplanted into a gorilla, creating Savage Dragon's foe, the Vicious Circle member Braini-Ape. In perhaps his most famous appearance, this character is in front of a television labeled "television" that shows a building labeled "U.S. munitions works" and is (*) falling onto a booklet marked "sabotage plans for U.S.A." For 10 points, name this character who is being punched in the face on the cover of Captain America Comics #1,  the boss of the Red Skull who appears in Fantastic Four as the Hatemonger.
This character assassinates the Joker at the end of the Elseworlds comic Batman: Dark Allegiances.  
Adolf Hitler