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.

Actor James B. Sikking, best known for roles in the TV shows “Hill Street Blues” and “Doogie Howser, M.D.” has died at the age of 90. Sikking died of complications from dementia ...