Plenty of theories are floating around in the newspapers. And many point out to one theory...Suicide: but It is IMPOSSIBLE that this man could have committed suicide. Pak team (without shohaib, asif) being eliminated from Worldcup was just around the corner, and it is highly probable that Bob would have predicted few losses for that Pak team. And think about the 1999 South Africa and Aus semi-final. He survived that moment when his home team lost by a thin margin. It is 100% certain that 1999-semi final loss for his home team could have hurt him more than this loss.
His interview immediately after the match shows how well he tried to manage the loss. He said "I've had bad days before, the worst of them was at Edgbaston in 1999 [when his South Africa team missed out on the final despite the game ending in a tie]. Things like this happen in cricket."
If we rule out suicide as the cause of his death. that'll leave us with only two options:
1. natural death
2. death by third party
Natural death..such as heart attack, etc....to have occurred on this occasion, especially after several hours of this event...is a statisticians' nightmare. And also, given the evidence that Bob took this not seriously as some of his past disappointments, it is highly unlikely that he got a broken heart.
Thus, we can safely conclude that was some third party(s) involved, and that too
- Someone he knew well (otherwise Bob wouldn't have let anyone into his room at that time)
- And someone he did not feel obligated to treat with some food (did not call food service)
- And someone he could talk to in a informal manner (presence of alcohol, and half-naked dressing (he was found in his bath towel))
- Someone who was big enough to bring down another man like Bob who was big, fit, strong and athletic. And that too in such a way that Bob couldn't call for help.
- Someone who did not have to flee the hotel building (otherwise he/she could have been caught by now by looking at the security camera tapes or some bystanders would have come up already saying that they spotted suspicious looking persons in hotel premises)
- and probably someone who took offence at the following instance, and was present at the site: "Despite the setbacks, there was still time for a droll moment, as someone asked what sort of reaction he anticipated when the team arrived home. "In my view, there won't be a reception," said Inzamam poker-faced, as a laugh escaped Woolmer's lips" (from the same post match interview)
P.S: If you are certain that there was no suicide..how about this twist? Lets say something was about to become public, which could make him infamous.....and he comes to know about it at that hour, and gives up his life. That something could be 'match-fixing'.....remember anyone named 'Hansei Cronje'........Bob was his coach.