Harry Potter author JK Rowling and protagonist of the films, Daniel Radcliffe, have paid tribute to the late Dame Maggie Smith. Smith, 89, died on Friday in hospital surrounded by family, and many of her co-stars have since shared sweet memories of the iconic actress. Radcliffe, 35, starred as the titular character in the Harry Potter franchise, while Smith played the beloved Professor McGonagall. “The first time I met Maggie Smith I was 9 years old and we were reading through scenes for ‘David Copperfield,’ which was my first job,” Radcliffe recalled in a statement. He continued: “I knew virt…