1) Character created by Jim Lee 2) Coup de grace 3) Event that causes the end 4) Fictional vigilante 5) Final shot 6) Kill 7) Killing 8) Putting to death 9) The blow that kills 
• (n.) A mortal or crushing blow; a stroke or event which kills or destroys.
Death'blow` noun A mortal or crushing blow; a stroke or event which kills or destroys. « The deathblow of my hope.» Byron. 
[n] - the blow that kills (usually mercifully)
coup de grace noun the blow that kills (usually mercifully)
a blow causing death.