Cillian O'Sullivan is an actor, known for 6Degrees (2012), An Cosc (2009) and Uncle Bill's Barrel (2008).
Chicago P.D. - Season 9
Chicago P.D. - Season 10
The Blacklist - Season 8
The Blacklist - Season 2
Bull - Season 2
FBI: Most Wanted - Season 5
The Blacklist - Season 10
Halo: Nightfall
Vikings - Season 4
The Blacklist - Season 7
Vikings - Season 3
Chicago P.D. - Season 5
FBI: Most Wanted - Season 3
FBI: Most Wanted - Season 2
Bull - Season 6
Chicago P.D. - Season 1
Bull - Season 3
Vikings - Season 6
The Blacklist - Season 6
Bull - Season 4
Bull - Season 5
The Blacklist - Season 3
Then You Run - Season 1
Taken Down - Season 1
Chicago P.D. - Season 11
Vikings - Season 2