Rif Hutton -- a familiar face to TV fans, especially to "Doogie Howser, M.D." devotees -- has died at 73 ... TMZ has learned. His family tells us the veteran actor passed away at his home in Pasadena, California on Saturday after a battle with brain cancer, which he had been fighting for more than a year. We’re told he was surrounded by loved ones. He is survived by his wife and son. Rif was best known for his role as Dr. Ron Welch on 'Doogie Howser' appearing in 17 episodes of the beloved