In the gray and somber world of ‘American Rust,’ Buell police chief Del Harris’ (Jeff Daniels) investigation slowly spirals out of control in episode 7. Billy (Alex Neustaedter) fights to survive in prison. Isaac (David Alvarez) descends into the depth of trauma after being beaten. Grace (Maura Tierney) finds herself becoming overwhelmed by the issues she faces in her personal and professional life. Meanwhile, Lee (Julia Mayorga) joins the public defender’s office. Here is everything you need to know about the ending of ‘American Rust’ episode 7. SPOILERS AHEAD.