The way the newspaper article was responded to by jack and kate make me feel like it was a suicide. So I started thinking about who would kill themselves after getting off the island, and who has no loved ones who care to be at the funeral. I came up with lock and ben. When asked are you friend or family, jack resonded with niether, which leads me to believe its either Jack or Ben. But in this show it could be a midget santa for all I know.