Former Russian spy Alexander Litvinenko has died in hospital three weeks after apparently being poisoned in London.
Mr Litvinenko, 43, had been critically ill in intensive care at University College Hospital after suffering a heart attack on Wednesday night.

Friends of Mr Litvinenko have claimed he was poisoned because of his criticism of Russian President Vladimir Putin - Russia has denied this.

Scotland Yard said they were now investigating “an unexplained death”.

Defector

A hospital spokesman said: “Every avenue was explored to establish the cause of his condition and the matter is now an ongoing investigation being dealt with by detectives from New Scotland Yard.

“Because of this we will not be commenting any further on this matter.

“Our thoughts are with Mr Litvinenko’s family.”

Mr Litvinenko, a defector to Britain who was granted asylum and citizenship, was apparently poisoned on November 1.

He had been investigating the murder of Russian investigative journalist Anna Politkovskaya.

Source: BBC