Ethan Roark

Senator Ethan Roark, also known as Roark Sr. (Roark Senior), is a villain in Sin City, featured as the secondary antagonist of That Yellow Bastard. He is a wealthy and corrupt politician who covers the crimes committed by his pedophile son, Roark Jr., also known as the Yellow Bastard. And he is also the younger brother of another even more powerful political figure, Cardinal Roark, whom through his influence, Senator Roark achieved his position.

In the film adaptation, he is portrayed by Powers Boothe.

Biography
Roark then planned to frame police detective John Hartigan for Jr.'s crimes. After being released from jail, Hartigan killed Jr., enraging Roark and causing him to plot revenge. Fearing that Roark will go after his girlfriend, Nancy Callahan, Hartigan commits suicide, rendering Roark's vendetta useless.