Owen is conflicted when his brother Robert (guest star CHAD Lowe) asks him for help; Judd and Grace face a family crisis; As T.K. and Carlos prepare for their wedding day tragedy strikes in the all-new "Best of Men" / "In Sickness and In Health" 4th season finale episodes of 9-1-1: LONE STAR airing Tuesday, May 16 (8:00-10:00 PM ET/PT) on FOX.