Question: What car accident in Massachusetts in 1969 was spoken in depth about by Ted Kennedy, including a reference to the Kennedy curse?

Context articles: Patrick Kennedy (1823–1858)
Ted Kennedy
Chappaquiddick incident
Kerry Kennedy
Kara Kennedy
Kennedy Compound
Kennedy curse
Jean Kennedy Smith
Mary Jo Kopechne
Jack E. Robinson III

Patrick Kennedy (February 16, 1823 – November 22, 1858) was an Irish farmer, businessman, and politician who moved to East Boston, Massachusetts from County Wexford, Ireland.
 He was born in New Ross, Ireland.
 He was the father of businessman/politician P. J. Kennedy, paternal grandfather of businessman/politician Joseph P. Kennedy Sr., and patrilineal great-grandfather of World War II casualty Joseph P. Kennedy Jr., President John F. Kennedy, Senator Robert F. Kennedy, and longtime Senator Ted Kennedy.
Edward Moore "Ted" Kennedy (February 22, 1932 – August 25, 2009) was an American politician and lawyer who served as a United States Senator from Massachusetts for over forty years from 1962 until his death in 2009.
 A member of the Democratic Party, he was the second most senior member of the Senate when he died and was the fourth-longest-continuously-serving senator in United States history, having served there for almost 47 years.
 Ted Kennedy was the most prominent living member of the Kennedy family for many years, and he was also the last surviving, longest-living, and youngest son of Joseph P. Kennedy, Sr. and Rose Kennedy.
 He was the youngest brother of John F. Kennedy, the 35th President of the United States and Senator Robert F. Kennedy, both victims of assassination, and the father of Congressman Patrick J. Kennedy.
The Chappaquiddick incident was a single-vehicle car accident on Chappaquiddick Island, Massachusetts, on Friday, July 18, 1969, that was the result of U.S. Senator Ted Kennedy's negligence and resulted in the death of his 28-year-old companion, Mary Jo Kopechne, who was trapped inside the vehicle.
Mary Kerry Kennedy (born September 8, 1959) is an American human rights activist and writer.
 She is the seventh child and third daughter of Robert F. Kennedy and Ethel Skakel Kennedy.
 After her 15-year marriage to now-New York Governor Andrew Cuomo, she was known as Kerry Kennedy Cuomo from 1991 until 2003.
 She is the president of Robert F. Kennedy Human Rights.
 She is also a niece of the late President John F. Kennedy and United States Senator Ted Kennedy, and a cousin of former U.S. Ambassador to Japan Caroline Kennedy and Maria Shriver, the estranged wife of actor, bodybuilder, and former California Governor Arnold Schwarzenegger.
Kara Anne Kennedy Allen (February 27, 1960 – September 16, 2011) was a member of the American political dynasty, the Kennedy family.
 She was the oldest of the three children of U.S. Senator Ted Kennedy from Massachusetts and Joan Bennett Kennedy, and a niece of President John F. Kennedy and Senator Robert F. Kennedy.
The Kennedy Compound consists of three houses on six acres (24,000 m²) of waterfront property on Cape Cod along Nantucket Sound in Hyannis Port, Massachusetts, United States.
 It was once the home of American businessman and political figure Joseph P. Kennedy Sr., his wife Rose, and two of their sons, President John F. Kennedy and Senator Robert F. Kennedy.
 Their youngest son, Senator Ted Kennedy, lived in his parents' house, and it was his main residence from 1982 to 2009.
 He died of brain cancer at the compound in August 2009.
The Kennedy curse is a term for the series of misfortunes involving members of the Kennedy family of the United States of America.
 While Ted Kennedy publicly wondered whether a "curse actually did hang over all the Kennedys" during his own testimony about the Chappaquiddick incident in 1969, skeptics have argued that many of the events are normal, and it is not improbable that a large extended family would experience them.
Jean Ann Kennedy Smith (born February 20, 1928) is an American diplomat who served as United States Ambassador to Ireland from 1993 to 1998.
 She is the eighth of nine children born to Joseph P. Kennedy, Sr. and Rose Fitzgerald, and is their longest-lived and last surviving child.
 Her siblings include President John F. Kennedy, Senator Robert F. Kennedy, longtime Senator Ted Kennedy, and Special Olympics founder Eunice Kennedy Shriver.
Mary Jo Kopechne ( ; July 26, 1940 – July 18, 1969) was an American teacher, secretary, and political campaign specialist who died in a car accident at Chappaquiddick Island on July 18, 1969, while she was a passenger in a car being driven by U.S. Senator Ted Kennedy.
Jack E. Robinson III (born May 12, 1960) is a former Republican politician from Massachusetts.
 He ran for the United States Senate in 2000 against Ted Kennedy (Democratic) and Carla Howell (Libertarian), losing to Kennedy.
 He ran for Secretary of the Commonwealth in 2002, losing to William F. Galvin, and for US House of Representatives in Massachusetts's 9th district in 2006, losing to Stephen Lynch.
 In 2009, he ran against Scott Brown in the Republican primaries for the special election to fill Ted Kennedy's Senate seat, but lost to Brown in the primary.