ooooooooh. no. no. no. no. no. no. no.
Oh no Jude.
I'm so sorry.
Oh god I know how this feels, its gutting and it pulls you apart inside. And you feel silly crying your eyes out and worrying about the other cat but you can't help it. It's natural.
And then Brokie will look so lost - Skimble was the same. He began meowing at himeslef in the mirror (they looked very similar)
I wish I could say something to make you feel better but I know I can't so I'm going to be practical.....This article was one I found when Sooty died and found it useful in delaing with Skimble -
http://www.messybeast.com/cat-grief.htm