What happened to the character that was dragged off by Walder's daughters? Maybe I missed it but can I assume he got killed like the others?
Edmure Tully is the name of the groom that married Roslin Frey at the Red Wedding.
He was not killed, and not really because he was part of the family now. Edmure was kept hostage at the Twins following the massacre, as he was heir to Riverrun, and keeping the Tully family and Riverrun in check once the Starks were removed was a high priority for all involved. Edmure will show up later to have an effect on the plot.