How does a party with mates end in murder? | Sunday Investigates 

In the early hours of Saturday morning, Sean Selby made a decision that landed him in jail for murder.
How does an 18-year-old with no criminal history commit one of the worst crimes imaginable? And what happened to his victim's family, whose lives were changed forever?
Sean Selby shares his story for the first time - confronting his past, and planning a very different future.
Reporter: Jehan Casinader
Producer: Del Byast
Camera: Will Green
Editor: Gareth Pearce
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