Killed by someone of a higher power, therefore investigations conclude it was suicide.
The authorities say he committed suicide days before he was to testify against George W Bush. I'm sure it was George's associates that suicided him.
when someone is murdered and then arranged in such a way to make the death seem like a suicide. the victim may also be forced to take his own life so that the real culprit leaves little to no evidence of wrongdoing. authorities rule the cause of death to be a plain old suicide which often means that no investigation is preformed.
the key witnesses were all suicided before they could testify. i guess they all were depressed or something. oh well. case dismissed!