Keir O'Donnell Joins Cast of FlashForward

The latest casting addition for FlashForward is almost as mysterious as the show itself.

Keir O'Donnell - best known for his role in Wedding Crashers - has joined the cast of the upcoming ABC drama. No word yet on what recurring character he'll play, but the actor joins an ensemble that includes Joseph Fiennes, John Cho and Sonya Walger.

O'Donnell also appeared in Paul Blart: Mall Cop and will have a part in The Runaways, the Joan Jett biopic starring Kristen Stewart and Dakota Fanning.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.