Aged 21, Casey decided to give up his position as an apprentice painter/decorator and become an actor. Casey appeared in 2006 in
The Wind That Shakes the Barley. His major breakthrough came in 2016, playing Billy Murphy, an unstable yet humorous Cork local, in the film
The Young Offenders. In 2018 it was rebooted as a TV series,
The Young Offenders, and Casey reprised his role. He has written a play,
Wet Paint, that has played at the
Cork Opera House, Cork Arts Theatre and
Everyman Palace Theatre. As a stage actor, Casey has participated in a number of stage plays, such as the role of Osric, an eccentric gossip blogger, in
Hamlet: Cybermadness. In 2026, Casey appeared as 'Mike' in the British horror short
A Hand to Hold, which was selected for the
41st Santa Barbara International Film Festival and the 2026
FrightFest in Glasgow. ==References==