[RightWhale]

do we have evidence that he is dead?

No evidence, but an eyewitness account of the death and burial, plus the PM of Pakistan --Musharaff's-- opinion, who seems to be a straightforward person [could be wrong, too.]

There may never be evidence.

[KC_Conspirator]

What did the eyewitness of the burial say? How did he die and where is the body? (Or is there a body?)