Despite ongoing reports that she wanted out of her Grey's Anatomy contract and that she was being killed off the show, Katherine Heigl said she wants to stay on the medical drama if her character, Izzie, survives brain surgery.

"I was assuming that [Izzie would die] at one point, and all I got were a lot of shrugged shoulders and shakes of the head, so I don't know if that's a yes or a no," she told the Associated Press Friday at a party celebrating the show's 100th episode.

"No one will tell me and I don't know how this is going to go."

Katherine Heigl noted that the decision rests solely with the show and series creator Shonda Rhimes, who is known to value plot secrecy.

"I don't know if I live or die," Heigl said. "I don't know how Izzie fares."

Dr. Izzie Stevens has metastatic melanoma - skin cancer - that spread to her brain, giving her only a five percent chance of survival, a story the show has built up for months courtesy of her visions of her late fiance, Denny Duquette (Jeffrey Dean Morgan).

On Thursday's episode, "Elevator Love Letter," she survived brain surgery.

Still, Heigl said, "I'm there" if Izzie remains part of Grey's Anatomy, for which she has starred since it debuted on ABC in March 2005. She called the set "one of my favorite places to be" and said her colleagues are also some of her best friends.

Rhimes, who is also an executive producer, declined to comment on what will happen to Heigl's character, but she did reveal a clue about the 100th episode, airing May 7.

"The only thing I'll tell you about the 100th is that it takes place on Meredith [Ellen Pompeo] and Derek's [Patrick Dempsey] wedding day," Rhimes said.

"That's big ... and that's all I'm going to say."

Well, guess we're no longer in the dark about that.

Katherine Heigl, who some thought was wanting to be released from the show to focus on her movie career (Knocked Up, 27 Dresses), said she's comfortable balancing film and TV work by taking on big-screen projects during the summer hiatus.

"I'm more than happy to make that compromise," Heigl said. "As my agent likes to say, 'High-class problems.' I don't know if I want to continue for five years working 12 months a year, but I can take at least another year or two."

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.