I’m so saddened by the news of actor John Mahoney’s death this Sunday! Mahoney co-starred in Frasier during the sitcom’s entire 1993 to 2004 run. His Marty Crane was the down-to-earth, dog-loving father of fastidious, social-climbing sons Frasier (Kelsey Grammmer) and Niles (David Hyde Pierce) — an ex-cop who was a source of conflict from the…