Jamaica Constabulary Force commissioner Lucius Thomas also ruled out match-fixing in relation to Woolmer's death during the World Cup tournament in the Caribbean.

Foreign pathologists "concur with the view that Mr Woolmer died of natural causes" while in further toxicology tests, "no substance was found to indicate that Bob Woolmer was poisoned," he said.

"The JCF accepts these findings and has now closed its investigation into the death of Mr Bob Woolmer," Thomas told a news conference.

Commenting on allegations of match-fixing, he added that "neither the ICC (International Cricket Council) nor the JCF have found any evidence of any impropriety by players, match officials nor management during the investigation of Mr Bob Woolmer's death." Woolmer, 58, died soon after being found unconscious in his hotel room in Jamaica on March 18 the day after Pakistan were knocked out of the cricket World Cup by Ireland.

An initial autopsy report proved inconclusive, but a pathology report later indicated he died of asphyxia as a result of "manual strangulation," which led the police to treat the death as murder.

The claims rocked the world of cricket amid speculation about links to an alleged gambling mafia.

"The Jamaica Constabulary Force adopted a thoroughly professional investigation where nothing was left to chance. Every effort has been made by the Jamaica Constabulary Force to seek the truth surrounding Bob Woolmer's death," Thomas said.

"My hope is that despite the trauma of the last two and half months, Mrs (Gill) Woolmer and her sons will be confident that the JCF has done all it can to establish the truth surrounding the death of her husband."