03/12/2010 AT 12:00 AM EST
Paging Dr. Stevens? Don't count on it.Katherine Heigl
is "not likely" to be back on Grey's Anatomy
after the current season, according to a source close to the situation.
Heigl, who was due back on the set
of the ABC medical drama after a three-month maternity leave but did not return to work
, is negotiating her way out of her contract.
"The details, the timeline of that – it's all shades of gray," the source says. "The terms of her exit are still being sorted out."
In the most recent episode to feature Heigl, her character, Dr. Izzie Stevens, walked away from the Seattle Grace hospital, leaving viewers to wonder whether she'll be back at all.
"You can always have her return in a compelling way, and leave in an equally compelling way, because show creator Shonda Rhimes
could certainly write that," the source said. "It's just not clear if she'll come back onto the canvas this season, for a farewell arc, or if her storyline is already done."
Reps for ABC Studios had no comment. Stay tuned!Tell us: Would you like to see Izzie come back for a farewell to Seattle Grace? Are is she already gone