The actor's other credits include 'General Hospital,' 'Little House on the Prairie' and 'Star Trek III: The Search for Spock' James B. Sikking has died at the age of 90, PEOPLE confirms.

James Sikking, who starred as a hardened police lieutenant on “Hill Street Blues” and as the titular character’s kindhearted dad on “Doogie Howser, M.D.,” has died at 90. Sikking died of ...