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Mark Prince was filled with grief and anger when his teenage son Kiyan was stabbed to death in 2006.

Kiyan was killed outside his school in North London when he stepped in to stop a fight. He was only fifteen years old.

He was a promising footballer and had already joined the youth team at the London club Queens Park Rangers.

In 2007 Hannad Hasan, another pupil from the school, was convicted of Kiyan’s murder and sentenced to life imprisonment.

Mark initially felt he wanted to kill his son’s killer, but he has now found the strength to forgive him.

Mark - a former boxer - now dedicates his time to trying to stop other young people getting involved in violent crime. He has set up a charity in Kiyan’s name and goes into schools to talk to youngsters about knife crime.

Last month he persuaded a London judge not to send a young cannabis grower to prison. Instead the young man is doing community work for Mark’s charity.

Mark told Matthew Bannister what kind of young man Kiyan was.

First broadcast 21 September 2010.