May 8, 2013 12:28 pm Finale Preview: “Grimm” Silas Weir Mitchell, David Giuntoli, and Bree Turner reveal cast members death on this seasons last episode of Grimm. The finale will air on NBC, May 21. Local 1:36 O.J. Simpson's cause of death revealed 2:36 Super dad makes Mario-themed obstacle course for son's birthday 2:03 Does Shakira still believe in love following Gerard Piqué split? 1:59 Ellen DeGeneres jokes about being ‘kicked out of show business' 0:59 Paramedic involved in Elijah McClain's death sentenced to 4 years of probation