Comedian Jim Gaffigan and actress Olivia Thirlby are set to join Jason Clarke, Kate Mara, Ed Helms and Bruce Dern in John Curran's drama "Chappaquiddick" at Apex Entertainment. The story tackles the seven most dramatic days in the life of Senator Ted Kennedy : On the eve of the Apollo 11 moon landing, the senator becomes entangled in a tragic car accident on Chappaquiddick Island in Massachusetts that results in the death of former campaign worker Mary Jo Kopechne .