Former celebrity publicist Max Clifford has died, the UK Ministry of Justice has said.
The 74-year-old collapsed at Littlehey Prison in Cambridgeshire, where he was serving an eight-year jail sentence for historic sex offences.
A spokesman for the British Ministry of Justice confirmed Clifford died in hospital.
"As with all deaths in custody, there will be an investigation by the independent Prisons and Probation Ombudsman," the spokesman said.
Clifford was jailed for eight years in May 2014 after being convicted of a number of charges under Operation Yewtree, the Metropolitan Police investigation set up after the Jimmy Savile scandal.
He was the first person to be convicted as part of the national investigation. During his sentencing, he branded his accusers as "fantasists".
The PR guru, who used his celebrity connections to lure women, was found guilty of a string of indecent assaults - with the sex attacks carried out between 1977 and 1984.
Clifford, who crafted a reputation for garnering maximum exposure for the fame-hungry wannabes in his charge, had been ill since suffering a heart attack in August.
