Killian trained at the Royal Central School of Speech & Drama.

Television includes: Boy Meets Girl (Tiger Aspect for BBC), Inspector George Gently (Company Pictures for BBC), Glue (Eleven Films for Channel 4).

Theatre includes: The Comedy About a Bank Robbery (Mischief Theatre, West End and No 1 Tour), The Austerity Playbook (Northern Stage), I and the Village (Theatre503), Jack and the Beanstalk (Park Theatre).

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