Sarah Phelps Creator, Executive Producer Sarah Greene Cassie Maddox, Lexie Mangan Actor Killian Scott Rob Reilly Actor Ned Dennehy Dr Cooper Actor Moe Dunford Detective Sam O'Neill Actor Jonathan Forbes Dr Mark Hanley Actor Jonny Holden Damien Donnelly Actor Ian Kenny Garda Phelan Actor Peter McDonald Jonathan Devlin Actor Leah McNamara Rosalind Devlin Actor Alexandra Moen Simone Cameron Actor Kathy Monahan Margaret Devlin Actor Eugene O'Hare Detective Devlin Actor Tom Vaughan-Lawlor Frank Mackey Actor Ellie O'Halloran Jamie Rowan Actor Niall Jordan Peter Savage Actor Michael Darcy Adam Reilly Actor Carmel Maloney Producer John Hayes Director Kate Harwood Executive Producer Noemi Spanos Executive Producer Saul Dibb Executive Producer Elizabeth Kilgarriff Executive Producer Tommy Bulfin Executive Producer Alan Gasmer Executive Producer Ed Guiney Executive Producer Peter Jaysen Executive Producer