A post-mortem on Pakistan coach Bob Woolmer has proved "inconclusive".
Further tests will now be carried out as a matter of urgency and the results could be known within 24 hours.
Woolmer died on Sunday, aged 58, after collapsing at the team hotel in Jamaica, a few hours after Pakistan's surprise defeat by Ireland.
When the investigation is completed, his body will be taken back to his home in Cape Town, South Africa, accompanied by team trainer Murray Stevenson.
Pakistan Cricket Board spokesman Pervez Mir told a news conference that further investigations were being carried out by a toxicologist and a histologist (scientist who examines body tissue).
And Mark Shields, deputy commissioner of the Jamaican police constabulary, said that the body could not be released until the pathologist had completed his examination.
"I know that the scientists are treating it with the utmost urgency in order that we can hopefully repatriate the body to his family as soon as possible," said Shields.
"I just know they are working as quickly as possible to provide the information that we need. I hope it's today but it could be tomorrow."
" Everybody is shocked because he was a good coach and a much better human being"
He added that it was quite normal for there to be delays over a post-mortem's findings and refused to speculate on the causes of the death.
On Monday, Shields said the death was being treated as suspicious.
But he added: "We would always treat any sudden death - even in the UK - as suspicious until we can prove otherwise."
Woolmer, who appeared in Tests for England during his playing career, had diabetes and there were reports he had recently complained of breathing difficulties.
His family say he had been suffering from stress and believe this may have brought on a heart attack.
Mushtaq Ahmed, who has taken over as coach for Pakistan's game against Zimbabwe on Wednesday, described the mood among the players as one of "total depression".
He said: "The loss of Bob Woolmer is the biggest blow in the history of the Pakistan cricket team. He was a father figure to all of us.
"There is a great vacuum because Bob had become part of the family and when you lose a member of the family one knows how bad it is. It is a very difficult time for all of us."
Mushtaq, who had been working alongside Woolmer as the team's bowling coach, added: "Bob was a great man who could forgive so much in spite of anything that happened.
"He also used to impart knowledge and was also such a good and kind human being.
"Bob was a great motivating factor for us, always trying to bring in new theories to improvise the game of cricket."