LAKE BUTLER, Fla. — Jay North, who starred as the towheaded mischief maker on TV’s Dennis the Menace for four seasons starting in 1959, has died. He was 73. North died Sunday at his home in Lake Butler, Florida, after battling colon cancer, said Laurie Jacobson, a longtime friend, and Bonnie Vent, who was his booking agent. “He had a heart as big as a mountain, loved his friends deeply. He called us frequently and ended every conversation with ‘I love you with all my heart,’” Jacobson wrote in