The youngest of the Walker siblings, Justin is war-scarred and self-destructive.
Inspired by Kitty, Justin joined the army and served in Afghanistan. Suffering from Post Traumatic Stress Disorder on his return, however, he gets addicted to drugs.
That's not his only problem. He's also a serial womaniser and constantly grapples with self-doubt, and his family’s view of him as incompetent. Kitty and Justin have a very close relationship, though, and she is often the one who steps in to resolve his disputes.
After being called back to Iraq, returning home and once more becoming addicted to painkillers, Justin starts to get himself back on the straight and narrow.
The course of true love never does run smooth for him though, as he soon finds himself attracted to half-sister Rebecca who he's always been close with. Luckily, she turns out not to be his half-sister after all (phew!) and they kiss at the end of Series 2.

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