If the story is true, Jackson would have been worth more alive than dead to many people including his entourage. If Jackson failed to perform due to ill health, the promoters of his upcoming series of 50 London concerts would lose all the money they put in. If he died, they could recover some or all of their investment from insurance. Someone in his entourage might have feared that Jackson would be sued and wiped out if the concert promoters had learned he had been too ill to perform when he made the contract. If he died, they at least would have the estate and children to pick over (or thought they would). His Nation of Islam bodyguards might be the obvious suspects because (1) no one can murder an individual easier than their own bodyguards and (2) they may have detested Jackson for his homosexuality.
As I wrote before, we see in superstars like Jackson all the psychopathologies that used to afflict the absolute rulers of old. Assassination would be just one more parallel.
Maybe we should issue an Intrade contract for when the first murder conspiracy book will be published. I’d put my money on 30 days.