Aged 21, Casey decided to give up his position as an apprentice painter/decorator and become an actor.
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.
[4] He has written a play, Wet Paint, that has played at the Cork Opera House, Cork Arts Theatre and Everyman Palace Theatre.
[5][6] Casey is also an experienced stage actor, and has participated in a number of stage plays, such as the role of Osric, an eccentric gossip blogger, in Hamlet: Cybermadness.