Jonjo O'Neill

Jonjo O'Neill is an actor from Northern Ireland known for his stage and television work. O'Neill was born in Belfast, grew up in the Whiterock Road area and was educated at St Mary's Grammar School and the Royal Belfast Academical Institution. Growing up he was passionate about musical theatre and was a member of the Ulster Youth Theatre and performed with the Ulster Theatre Company.

CONSTANTINES1, E4

A Feast of Friends

When Constantine's old friend Gary Lester accidentally releases a powerful demon in Atlanta, John is forced to determine exactly what he is prepared to sacrifice in his battle with the underworld.
CONSTANTINES1, E11

A Whole World Out There

A paranormal experiment goes horribly wrong when a group of students tests a disturbing theory. Manny sends John to help his old friend, Ritchie Simpson, at Ivy University, where a group of his students have unknowingly found a way into an alternate dimension only to be met by a maniacal killer (guest star William Mapother).