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The sister of a man who was travelling the world but became one of millions of people murdered by Cambodia's brutal Khmer Rouge regime, has spoken about his death.

John Dewhirst was captured by Pol Pot's army and sent to a notorious prison camp called Tuol Sleng prison or S-21.

This week in Cambodia, the man that ran the prison is due to take the stand in a war crimes tribunal.

Victoria spoke to Hilary Holland about her brother.