Ahead of his character's arrival, Donald said: "Kieran is a troubled guy dealing with both addiction problems and mental illness issues. He's a kind person deep down but has lost his way after a troubled childhood. On how his addiction will impact his relationship with Martha, he said: "His drinking pushes everyone away and creates a bigger problem of lying to his mother... It's not going to help patch things up if he's lying from the start." Seven Network "It's a tough relationship with a lot of unsaid issues keeping them from the healing they both desperately need," he added.