What good could come of revealing it? What if it was some health problem, do we need threads filled with people saying he should've lived healthier? The cause is nothing but a distraction and just because people want one doesn't mean they should have one.
I've posted this before, but it could help a lot of people. Sometimes people need a kick in the teeth to change their lifestyle, whether that be getting evicted so you find a job or have a friend die to heart disease (due to obesity) so you live healthier.
Don't act like nothing good would come out of a celebrity with a close knit community dying to a preventable disease.