Magnum P.I. 1×17 “Black Is the Widow” Season 1 Episode 17 Promo – After a man is murdered, Magnum poses as a doctor on the same dating app the victim was using in order to find the killer who may be praying on wealthy men, on MAGNUM P.I., Monday, March 4th on CBS. Guest stars include Milwaukee Brewers outfielder Christian Yelich and HAWAII FIVE-0’s Dennis Chun as HPD Sgt. Duke Lukela. Also, the 2018 Honolulu Little League World Series Champions make an appearance.