Cillian O'Sullivan is an actor, known for 6Degrees (2012), An Cosc (2009) and Uncle Bill's Barrel (2008).
FBI: Most Wanted - Season 6
The Blacklist - Season 10
The Blacklist - Season 4
Then You Run - Season 1
Bull - Season 1
FBI: Most Wanted - Season 1
FBI: Most Wanted - Season 4
FBI: Most Wanted - Season 5
Chicago P.D. - Season 9
Chicago P.D. - Season 2
Halo: Nightfall
FBI: Most Wanted - Season 2
The Blacklist - Season 6
Maze (2017)
The Blacklist - Season 3
Vikings - Season 1
Bull - Season 6
Chicago P.D. - Season 12
Taken Down - Season 1
Bull - Season 3
The Blacklist - Season 2
Chicago P.D. - Season 10
Chicago P.D. - Season 11
Chicago P.D. - Season 4
Bull - Season 2
The Blacklist - Season 8