Ronald Clark O'Bryan (October 19, 1944 – March 31, 1984), nicknamed The Candy Man and The Man Who Killed Halloween, was an American former optician from Deer Park, Texas convicted of killing his eight-year-old son Timothy on Halloween 1974 with potassium cyanide-laced Pixy Stix in order to claim life insurance money to ease his own financial troubles, being over $100,000 in debt at the time.