Police in Jamaica investigating the murder of Pakistan cricket coach Bob Woolmer say they do not think his killer was from the local community.
Woolmer's body will remain in Jamaica until after an inquest
But they have not ruled out the involvement of a professional hit-man in the death of the 58-year-old.
Deputy police commissioner Mark Shields said: "That's a possibility. I rule absolutely nothing out at all."
Shields believes suspects are unlikely to be Jamaican, as firearms or knives are the local "favoured weapons".
Shields, who is leading the investigation, said: "It seems highly unlikely a Jamaican has walked off the street, gone up to the 12th floor in a secure lift, gone along to his room, got into his room without any sign of forced entry, murdered him and then not stolen anything at all."
He confirmed that the manager of the International Cricket Council's Anti-Corruption Unit is investigating any possible links between the murder and match-fixing.
He said: "The match-fixing aspect of this is being carefully handled. Jeff Rees from the ICC is here at the moment, from the Anti-Corruption Unit.
"He's going to assist us. I promised him a couple of officers to work along with him.
"He and his team have the expertise. We have to tap into that to see if there's anything within their world of corruption that may have some impact on Bob's death."
But former Pakistan cricket captain Imran Khan was dismissive of the match-rigging link.
Imran said: "I still find it hard to believe that anyone would have a motive to kill Bob Woolmer.
"It makes no sense, this theory about some match-fixing mafia."
The Pakistan team is in London on its way home. Mr Shields said he let the team leave to avoid a diplomatic row.
He said he was working with Pakistani diplomats to secure their return to Jamaica if needed.
The two countries have no extradition treaty.
CCTV footage from the Kingston hotel where Mr Woolmer was strangled eight days ago is being examined.
Mr Shields, a former Scotland Yard detective, said he was hopeful that the footage from the 12th floor of the Pegasus Hotel could yield images of whoever strangled Woolmer last week.
The tapes are now in a secure location and being converted digitally in order to enhance the quality of the images.
Mr Shields said the CCTV cameras were installed at either end of the corridor and that, while they did not show Woolmer's actual room, they should tell police who came in and out of the passageway.
"They are crucial as they may give us an image of the murderer or murderers of Bob Woolmer," he said.
The records of every door keycard in the hotel are also being examined in order to determine movements in and out of rooms.
"It's a huge task. But when we do that we get the time of death."
Detectives in Jamaica believe Woolmer probably knew his killer - or killers - as there were no signs of forced entry into his room and none of his belongings had been stolen.
Pakistan's players have given police DNA samples and fingerprints as part of the probe into Woolmer's murder.
Pakistan captain Inzamam-ul-Haq, team manager Talat Ali and assistant coach Mushtaq Ahmed spoke to police for a second time on Saturday before the team left Jamaica.
The players are staying at a hotel near Heathrow Airport in London and will fly home on Tuesday, said team spokesman Pervez Mir.
Suggestions of a heated row between Pakistan cricketers and Woolmer hours before his murder have been denied by Mr Mir.
The Pakistan team are staying in London before returning home
He said there was silence, not confrontation, in the wake of the surprise loss of their World Cup match to Ireland on 17 March.
Woolmer was found strangled in his hotel room early the next day.
The chairman of the Pakistan Cricket Board, Dr Nasim Ashraf, said Woolmer sent him an e-mail after the defeat announcing his retirement.
Members of the International Cricket Council's (ICC) anti-corruption unit have arrived in Jamaica and are looking at the Ireland game.
Woolmer's body is being kept in Kingston until an inquest is held.