(PEOPLE) -- 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 — and PEOPLE has the exclusive first trailer and teaser poster!
Advertisement - story continues below
The film, directed by John Curran, stars Jason Clarke as Senator Kennedy, Kate Mara as Kopechne, and Bruce Dern as Ted’s father Joe Kennedy. It’s based on the 1969 inquest into the accident.