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 Sikking, who had television roles on "Hill Street Blues" and "Doogie Howser, M.D." has died from complications from dementia, according to his publicist Monday. He was 90. Sikking ...