Nearly five decades ago, on July 18, 1969, a car went off the Dike Bridge on the island of Chappaquiddick. The driver, Ted Kennedy escaped. His 28-year-old passenger, Mary Jo Kopechne, did not. An upcoming movie, Chappaquiddick, attempts to tell the story of what happened that night and why it took Kennedy some ten hours to report the accident to the local Edgartown police.