A Birmingham man on remand who had been accused of fatally stabbing another man in London's East End has died.
The Prison Service said Godfrey Moyo, 25, of Handsworth, was removed from his shared cell at HMP Belmarsh, south London, early on Monday.
Mr Moyo, who denied murder, was taken to an intensive care cell. Staff found he had stopped breathing and he was pronounced dead on arrival in hospital.
Fifi Mwenya, 28, was attacked by two men in Canning Town in June 2004.
He was assaulted outside the Dartmouth Arms pub in
Bidder Street and later died.
The Prison Service could not confirm the cause of Mr Moyo's death, but it is not believed he had hanged himself.
A Prison Service spokeswoman said: "Mr Moyo's behaviour in his shared cell early Monday morning led to his removal by trained staff to an intensive care cell in healthcare, where he was treated.
"He was subsequently found to be not breathing. CPR was administered immediately by staff and emergency services were summoned."
She added that an investigation had been launched by the Prisons and Probation Ombudsman.
Mr Moyo, who had been awaiting trial at the Old Bailey, was pronounced dead at Queen Elizabeth Hospital, in Woolwich, at around 0540 GMT on Monday.