Downton Abbey Season 3 to Feature a Major Character's Death 

I hope its Robert. Might shake things up a bit in the household.

It would seem plausible if were one of the older characters; Violet, Carson, Isobel, Mrs. Hughes, Mrs. Patmore, Robert, Cora. But, the shock value wouldn't be there. Watching this show long enough, I know how they like to drive emotions, so, it could very well be one of the younger ones.