Junior Rennie

Jim Rennie, Jr. is the secondary antagonist of the Stephen King novel Under the Dome, and the son of the novel's main antagonist James "Big Jim" Rennie.

He is a small town thug.

Under The Dome
Since Dome Day, he is deputized, and he recruits new police officers for his father. Junior gradually devolves from a thug to a bitter, angry sociopath, suffering from a brain tumor disguising itself as migraines. He particularly hates Dale Barbara, who laid a beating on Junior and his friends even though they outnumbered him. Dale could have had Junior arrested for assault, but Dale was an outsider and Junior's father was Big Jim. Junior murders Angie McCain early in the story, and Angie's friend Dodee Sanders a short time later when she stops by the McCain house. He later molests the corpses of the two women, referring to them as his "girlfriends" in his delusional state. He slowly becomes more delusional as the novel progresses and his tumor becomes more debilitating. Eventually Junior comes to the conclusion that Barbara has poisoned him and sets out to kill him. He later murders special deputies Stacey Moggins, Rupe Libby and Mickey Wardlaw by shooting them, before being killed himself by Jackie Wettington.