Who is Big Bern Kells?

Big Bern Kells is Big Ross's partner who returns from the Ironwood Trail with a story about Ross being killed by a dragon. Kells marries Nell and begins abusing her, even blinding her after Tim opens his trunk and retrieves Ross's lucky coin. It is determined that Kells murdered Ross, so kells hides out for several days, returning to Nell's cottage to kill Widow Smack. He chokes Tim, attempting to murder him as well, but Nell stops Kell by hitting him in the back of the head with her deceased husband's hand ax, killing him.