Katherine Heigl Sticks with Grey's Anatomy for Season Six

Reps decline to comment on media reports that the star has agreed to a deal

The cast lineup for season six of Grey's Anatomy is becoming clearer by the day.

Following on Marc Malkin's report last month that star T.R. Knight is leaving the series, a source confirms that Katherine Heigl "will be back."

But what's the official word from the show bosses and Heigl's people?

Reps for the hit ABC series and for Katherine Heigl both declined to comment.

Season five ended on a double-death cliffhanger, as Knight's character, George O'Malley, struggled to survive massive trauma inflicted by a bus accident, and Heigl's character, Izzie Stevens, endured life-threatening complications of her cancer treatment.

The split decision—Knight goes and Heigl stays—was telegraphed in the fifth season finale's episode-ending dream sequence, wherein Izzie seemed drawn back to the voices of the friends trying to save her life, while George seemed serenely ready to move into another phase of his existence.