David O'Hara

Film Deaths

Link (1986) [Tom]: Falls to his death when the monkey Link pulls him into a well. (Thanks to Kyle)
Oliver Twist (1997) [Bill Sikes]: Presumably hanged when the rope gets tangled around his neck as he tries to swing across the courtyard. (I haven't seen this version, but I'm familiar with the story.)
Jesus (1999) [John the Baptist]: Beheaded (presumably off-screen) by Luca Barbareschi's soldiers at Gabriella Pession's request.
The Departed (2006) [Fitzy]: Shot in the head during a shoot-out with police.
Tristan + Isolde (2006) [King Donnchadh]: Shot in the back with an arrow by one of his own men after Rufus Sewell tells the men to choose sides. He then charges after his men. His fate is unknown after that point.
Wanted (2008) [Mr. X]: Shot in the head with a sniper rifle by Thomas Kretschmann while David is standing on a rooftop; the scene then rewinds to show the bullet's path going back to Thomas.
Cowboy & Aliens (2011) [Pat Dolan] Shot in the head by Daniel Craig.

Gotham: Beasts of Prey (2015) [Reginald Payne]: Pushed out of a window by Camren Bicondova after David threatens to expose David Mazouz' investigation to the board of directors.