http://news.bbc.co.uk/1/hi/world/south_asia/6482981.stmPakistan's cricket coach Bob Woolmer was murdered in his hotel room on Sunday after the team's World Cup loss to Ireland, Jamaican police say.
A post-mortem examination established that the former England player had died as a result of "manual strangulation", police Commissioner Lucius Thomas said.
"In these circumstances, the matter of Mr Woolmer's death is now being treated as murder," he added.
Police have appealed for any witnesses to come forward.
The statement was read by a police spokesman at the Jamaica Pegasus Hotel - where Mr Woolmer, 58, was found unconscious by staff on Sunday morning.
Mark Shields, the deputy chief commissioner of Jamaican police, said there could have been one or more people involved in the murder.
"Bob was a large man. It would have taken some significant force to subdue him," Mr Shields said.
He said there were no signs of a struggle or forced entry which would suggest Mr Woolmer knew who his killer or killers were. He urged them to turn themselves over to the police.
All those who were staying or working at the Pegasus hotel where Mr Woolmer was found on Sunday are being questioned and authorities are studying CCTV footage.
Mr Shields said that police were ruling nothing out and had "lots of lines of inquiry".
'Resolute and strong'Earlier, Jamaican police questioned members of Pakistan's cricket squad over the death.
After being interviewed for about an hour and fingerprinted, the team left for the resort of Montego Bay.
They are due to return to Pakistan on Saturday but it was not clear if the team would be asked to remain in Jamaica pending the investigation.
The BBC's Andy Gallacher in Kingston says Mr Woolmer's death has cast a long shadow over the cricket World Cup.
However, the sport's governing body, the ICC, said the World Cup would continue as planned.
ICC chief executive Malcolm Speed said Mr Woolmer's death had been "a huge shock" but that it was "a challenge to the game to be resolute and strong and finish in good spirit".
He said the former London Metropolitan Police commissioner Paul Condon was standing by to assist with the murder inquiry.
Author