Grimmlokk
Ahn'Qiraj Raider
I might be misremembering but I thought it was pretty clear Tywin at the very least helped orchestrate the Red Wedding. Not in a "Send your kids and help a little" way, but in a "betray them and your word and murder them and I'll be your pal" kind of way.
Not sure if it's specified later, at the feast it says...Didnt Bolton himself put his sword thru Robb? It's been a while but I recall the swordsman saying something like Jayme sends his regards before giving him a taste of steel (prior Jayme had said to Bolton to say hi to Robb for him).
Doesn't specify Roose, and the last time he IS mentioned before it is excusing himself to go to the privy before it all sets off. Are the Boltons themselves the only ones that wear the pink cloak, or do their men also wear them?A man in dark armor and a pale pink cloak spotted with blood stepped up to Robb. "Jaime Lannister sends his regards." He thrust his longsword through her son's heart, and twisted.