It was said that Pasdar wasn't warned about his fate and learned about it through his final script. It wasn't said when Pasdar's Petrelli would be killed off exactly, only that it would be sometime this season.
One of the show's other stars, Greg Grunberg, recently told a radio station that both Pasdar and Milo Ventmiglia, who plays Nathan's brother Peter, were both "safe" this season, but the site's source confirmed that it was in fact Pasdar.
"I know Adrian is getting killed off and was pissed about it because they didn't tell him...Greg could be talking about another death but I think he's probably covering and throwing fans off," said the site's source.
We'll be sure to keep you postd on this breaking story and any other Heroes news as soon as we have more information.