A man who helped convict a murderer says he regrets it

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A police informant whose evidence helped to convict a double murderer, says if he could go back in time he would let the killer walk free.

'Harry' (not his real name) has never spoken about the crime publicly before but in an exclusive interview with Radio 5 live he says he is now living in fear of reprisal attacks.

The 50 year-old man rejected an opportunity to go on a witness protection programme because he said it would mean losing contact with his family.

He tells Radio 5 live's Victoria Derbyshire about the circumstances that led to him coming forward with information.

For more radio 5 live stories and interviews, please visit the best bits page.

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