At the time of writing, the body has not be formally identified as that of David Kelly. Once that is done, there will a post mortem examination, and on its completion, they may advise the reason for death - it may simply be cloaked under the euphemism 'tragic circumstances' without specifically advising what happened. The media hype that suggests that David Kelly was driven to suicide by his interrogation by the Select Committee may well have some basis in truth, but it going to be impossible to apportion blame with any accuracy - there could be other factors of which the public will never be made aware.