9-1-1: Lone Star boss on Grace in peril and Robert's Huntington's disease
'9-1-1: Lone Star' co-creator and showrunner Tim Minear breaks down season 4, episode 15, 'Donors,' including Sierra McClain's Grace facing an organ harvesting ring, and Owen (Rob Lowe) and TK (Ronen Rubinstein) learning Owen's half-brother Robert (Chad Lowe) has Huntington's disease.