Bob Woolmer may have been murdered on the instructions of an illegal betting syndicate, says former Pakistani fast bowler Safraz Nawaz.

The former Pakistan coach was found unconscious in his Jamaican hotel room near pools of blood and vomit on Sunday, hours after Pakistan's shock loss to Ireland at cricket's World Cup.

Jamaican police said on Wednesday they were treating the 58-year-old's death as "suspicious" and Safraz believes rightly so.

Safraz claimed Woolmer was about to reveal the dark world of match-fixing, which has plagued Pakistan for years, in a book entitled Discovering Cricket, News Limited newspapers report on Thursday.

"Has Woolmer carried with him to the grave dark secrets that could have brought ruin upon Pakistan's players?" Safraz was quoted as saying in News Limited papers.

"Did he pay for being the unwitting receptacle of information that was never to be shared?"

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