Katherine Heigl and her man Josh Kelley went to the Coldplay concert last night in LA, looking unfazed by the continuing news that Izzie might be killed off Grey's Anatomy this season. The new rumor is that Izzie will develop a potentially fatal brain tumor, with the chance of dropping dead at any moment. The best part about this dark storyline is that Izzie will see visions of Denny, which means Jeffrey Dean Morgan would be back! While it’s confirmed that he will return, all they've said about Izzie's storyline is that it is "unbelievable". Grey's? Unbelievable? Never. Hopefully we’ll have more details after Buzz chats with the writers at the TCAs tomorrow.