Cillian O'Sullivan is an actor, known for 6Degrees (2012), An Cosc (2009) and Uncle Bill's Barrel (2008).
Bull - Season 4
Chicago P.D. - Season 2
The Blacklist - Season 9
The Blacklist - Season 8
Chicago P.D. - Season 1
The Blacklist - Season 1
Maze (2017)
Vikings - Season 1
Taken Down - Season 1
The Blacklist - Season 10
Chicago P.D. - Season 6
The Blacklist - Season 6
Bull - Season 2
Chicago P.D. - Season 7
FBI: Most Wanted - Season 5
The Blacklist - Season 3
Vikings - Season 3
Chicago P.D. - Season 10
Vikings - Season 4
The Blacklist - Season 2
FBI: Most Wanted - Season 1
Chicago P.D. - Season 4
FBI: Most Wanted - Season 4
Vikings - Season 6
Chicago P.D. - Season 5
Vikings - Season 2