WOAH! Say it ain't so... Via Naughty Gossip, The creator of the show Modern Family Christopher Lloyd said,
"It is certainly a topic that families have to deal with, and on television, it’s not easy to do because that’s a heavy subject. At the same time, it would seem unusual for a family not to go through it. The death will be a moving event — and an event that has repercussions across several episodes."
So a BIG character is going to be killed off of Modern Family and no one has any idea who it's going to be!