Two of your public figures have called for his death. The crime which even now is being fabricated is one of treason. As one of the few countries who still practice the death penalty I would say its a better than even bet that he would not live out his three score and ten in the US.
Sadly, those threats are apparently not all official, and I doubt that Assange's "execution" will be official.
Perhaps a suicide or accident is being arranged by the people in power he exposed as buffoons and liars.
http://www.prisonplanet.com/murder-threats-to-family-of-julian-assange.html