A mother jailed for supplying her son with heroin and crack cocaine from the age of nine died today after being found hanging in her cell.

Emma Kelly, 31, was discovered by staff at Send prison in Surrey at 11.30pm yesterday.

A Prison Service spokeswoman said Ms Kelly was revived but died in hospital at about 12.45am today.

The inmate, from Eastbourne, East Sussex, was serving nine years for supplying Class A drugs and child cruelty.

She had even delivered heroin to him at the gates of his primary school.

In a police interview, the boy said the first drug he took was heroin at the age of nine, and he was 10 when he first tried cocaine.

Jailing her at Hove Crown Court last August, Judge Anthony Niblett told Kelly: "There can be no greater betrayal of a mother's trust and duty towards her child."

Referring to an occasion when she supplied her son with a wrap of heroin outside the school gates, he said: "This was, in my assessment, an act of pure wickedness.

"You offered no explanation or excuse for it, and there can be none."

Kelly, a former trainee jockey, admitted supplying the drugs between August 2002 and May 2005, and to two counts of child cruelty between August 2003 and January 2005.

Her son, who cannot be named for legal reasons, is now 13 and living with foster parents.