O'Malley's mother, Hilda Moriarty, is the subject of Patrick Kavanagh's famous Irish love song On Raglan Road.
In the 1970's O'Malley was a founder member of London's first community theatre - Common Stock - which brought theatre to the poor of London's East End . Dame Harriet Walter was also a founder member.
Produced the Irish version of The Rocky Horror Show - described by writer Richard O' Brien as 'sexiest version of my show ever produced'.
Studied at The London Academy of Music and Dramatic Art.
In 2015 it was announced that Daragh O'Malley would portray Marlon Brando in the play "Brando - Memoirs of a Giant ".
O'Malley was the voice of the crooked lawyer Nick Virago in the Lucas multi million seller Grim Fandango.