Tim Kring talked tvguide and confirm that, one of our Heroes will die tonight, but maybe somehow he/she’ll reappear on show.

Someone with superpowers will die. But it could have been much worse, Kring claims.
“We originally intended the Grim Reaper to come sooner and more often. In fact, we started out with a couple of the heroes already on the chopping block.” What saved them? “Every actor and character is working so well that it’s been hard to let anyone go. Still, killing this [character] will generate a tremendous amount of story.”

But does death on Heroes really mean death? What with the flashbacks, the wild dreams and Hiro’s ability to time-jump, might we see the doomed star again?
“There is a fluidity to our show,” Kring concedes. “People can come and go… and reappear.”