David Cassidy, the former teen heartbreaker who starred on the 1970s sitcom The Partridge Family and had a handful of pop hits, has died, days after reports surfaced that he was suffering organ failure. He was 67 and suffered from dementia, complicated by liver and kidney shut-downs. Cassidy had been hospitalized in Florida. His family issued a statement tonight: “On behalf of the entire Cassidy family, it is with great sadness that we announce the passing of our father…