Katie Cassidy paid tribute to her late father, David Cassidy, with a heartbreaking post on Friday that revealed his last words to her. The Arrow actress, 30, who reportedly had a turbulent relationship with her dad, took to Twitter to thank fans for their outpouring of support. "Words cant express the solace our family’s received from all the love & support during this trying time. My father’s last words were “So much wasted time”. She wrote.