He had torn off the assassin's mask revealing a lipless mouth cut wide across the man's cheeks filled with razor sharp teeth.
The assassin would become infamous for destroying the city and would forever be known as the Joker. 
mnli hypothesis: The assassin would become infamous for destroying the city and would forever be known as the Joker.  premise: He had torn off the assassin's mask revealing a lipless mouth cut wide across the man's cheeks filled with razor sharp teeth.