Charles Siebert, an actor and director best known as Dr. Stanley Riverside II in the M.A.S.H. spinoff, Trapper John, MD, has died at the age of 84. He passed away in California due to Covid-induced pneumonia. He first trained in theater and got his start appearing in regional performances across the country, and he eventually gained roles in several notable Broadway productions like The Gingerbread Lady by Neil Simon, a revival of Cat on a Hot Tin Roof, and the musical Jimmy Shine with Dustin Hoffman. Charles Alan Siebert was born on March 9, 1938 in Kenosha, Wisconsin. He trained in acting at…