Katherine Heigl was one of television’s biggest stars during her time on “Grey’s Anatomy”, but as soon as she found success she discovered that Hollywood was calling for a move to film. Now, she’s making the switch back to t.v. after seeing several movies stall at the box office, and one former co-star spoke recently about Heigl’s mistake…and the dramatic departure she made from one of the hottest shows on t.v.

“You could understand why she wanted to go — when you’re offered $12 million a movie and you’re only 26,” Ellen Pompeo said. “But Katie’s problem is that she should not have renewed her contract. She re-upped, took a big raise and then tried to get off the show. And then her movie career did not take off.”

In September, a story that ran in The Hollywood Reporter quoted directors and fellow actors who spoke out about Heigl’s bad attitude on set and how she got her reputation for being “difficult”.

“She can cost you time every single day of shooting,” said a source who worked with Heigl on 2010′s “Life As We Know It”. “Wardrobe issues, not getting out of the trailer, questioning the script every single day. Even getting her deal closed at Warners was hard. She hit that point of ‘no.’”

Heigl is preparing for a return to television with a CIA drama on NBC, which she reportedly shopped around for a while before finding a home.

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