The question is, how far would Lucas have had to go to convince you that Boba Fett or Mace Windu were dead? Would he have to zoom the camera inside their rib cages so that we can watch their heartbeats slow to a complete stop?! Would he have to show the same scene a few weeks later so that we can watch their corpses decompose?! Nobody does this in movies - it's bloody ridiculous. Boba and Mace are dead. CANON dead. One of the worst aspects of the PT is having GL slap you in the face with the obvious at every turn, and now comes ONE scene (finally!) where he doesn't, and you give creedence to his patronisation by assuming that because you don't see every stage of Fett's and Windu's respective deaths, that they aren't dead!

Windu died a bloody, bone-crushing death - his fried, bloody corpse splattered by either the traffic or Coruscant's city floor.

Fett died in the belly of the Sarlacc (which didn't have a cruddy CG beak), where he was slowly digested over a period of a thousand years.

Both are implied to the point of OBVIOUS.