Katherine Heigl wants back on Grey's

Los Angeles - Katherine Heigl wants to return to Grey's Anatomy.

Although the Knocked Up star left the ABC show in a storm of controversy in 2010 after criticising her character Izzie Stevens, the actress admitted she has already told showrunner Shonda Rhimes that she is keen to return to the medical drama, though she is unsure if it will be possible.

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Katherine told E! Online: "I've told them I want to [return]. I don't know... Being a showrunner and being a writer of a TV series like that is so complicated that I mean she's got how many characters are there now?

"There's a lot and so she's balancing about 40 different storylines, so I don't know if it fits in to their sort of vision for this season or next or however many seasons it goes."

Izzie's fate

The 33-year-old actress revealed the main reason she hopes to return is so she can discover Izzie's fate as the surgeon was last seen leaving the fictional Seattle Grace Hospital after husband Alex ended their relationship.

She said: "I really, really, really want to see where [Izzie] is. I just want to know what happened to her and where she went and what she's doing now.

"My idea is that she actually like figures it out, and finds some success and does really well in a different hospital. She was always floundering you know, and so she was always one step behind the eight ball and I want to see that girl take some power back."