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David Cassidy's last words offered his family a bittersweet lesson. "Words cant express the solace our family’s received from all the love & support during this trying time," tweeted the singer's daughter, 30-year-old Arrow actress Katie Cassidy, on Friday. "My father’s last words were 'So much wasted time'. This will be a daily reminder for me to share my gratitude with those I love as to never waste another minute....thank you." Cassidy, 67, died Tuesday after struggling with substance abuse for years, according to Us; he ultimately succumbed to organ failure. People notes that Katie was raised by her mother and stepfather and had an at-times tumultuous relationship with her father; earlier this year Cassidy said he and his daughter were not in touch. (Read more David Cassidy stories.)