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. Read More: 17 Shows That Changed TV Sikking died of complications from dementia, his publicist Cynthia Snyder said in a statement Sunday evening. [time-brightcove not-tgx=”true”] Born the youngest of five children on March 5, 1934 in Los Angeles, his early acting ventures included an uncredited part in Roger Corman’s Five Guns West and a bit role in an episode of Perry Mason.