By Malcolm Prior BBC News, Wokingham

The mother of Twood, right, has backed the UK amnesty

Nuttawut "Twood" Nadauld was found dead in a field in Barkham, Berkshire, on 11 September, 2005, alongside his 16-year-old friend Steven Bayliss.

Twood's guardian Gerald Pontet issued an emotional statement from Twood's mother backing the five-week amnesty.

"Please don't let more mothers join the living dead," his mother Sumintra said.

The full statement given to the BBC read: "My life goes on; everyday I remember to breathe, eat and drink.

If my experience and the heartache and pain of Sumintra can save a life it will be worth the publicity Gerald Pontet

"I live because I do this and because my mum is here to help me. But my son was my prince and he is gone forever and without him my life is no longer important to me.

"I live because I'm not dead. Please don't let more mothers join the living dead. Please don't carry a knife."

To highlight the amnesty, Mr Pontet was due to speak to Twood's classmates at an assembly at the Emmbrook school in Wokingham, where he planned to read out the statement.

He told the BBC News website: "If my experience and the heartache and pain of Sumintra can save a life, it will be worth the publicity which we have previously told you we would rather avoid."

A group of 15 friends of the two teenagers have also grouped together to visit schools in the area and raise the profile of the amnesty, with local youth workers' backing.