Question: What is the name of this single-vehicle car accident involving a US Senator and his companion, who was an American teacher, secretary, and political campaign specialist?

Context paragraphs:
Leonard Cave: Leonard E. Cave (October 22, 1944 – June 11, 2006) was an American sculptor who worked in the DMV area.  Cave exhibited his works in solo and group exhibitions mainly within the United States and Japan.  He primarily worked with wood, carving large sculptural and abstract pieces, though he also worked with other materials, such as metal.  In 1984, Cave founded the Washington Sculptor's Group in Washington, D.C.  He presided over this group for several years, though he was also a professor at Georgetown University and a public school teacher.  He died in 2006 after sustaining fatal injuries from a car accident involving a drunk driver.

1955 Hawaii R6D-1 crash: The 1955 Hawaii R6D-1 crash was an accident involving a Douglas R6D-1 Liftmaster of the United States Navy which crashed into a mountain peak in Hawaii on 22 March 1955, killing all 66 people on board.  At the time, it was the worst crash involving any variant of the Douglas DC-6 airliner the second-worst aviation accident in U.S. history, and one of the worst air accidents anywhere in history, and it equalled the 11 August mid-air collision of two United States Air Force C-119G Flying Boxcars over West Germany and the 6 October United Airlines Flight 409 crash as the deadliest air accident of 1955.  It remains the worst air disaster in the history of Hawaii and the deadliest accident involving a heavier-than-air aircraft in the history of United States naval aviation.

Airbus Industrie Flight 129: Airbus Industrie Flight 129 was an Airbus Industrie A330-321 test flight that ended in a crash on none }} at Toulouse-Blagnac Airport, killing all seven people aboard.  The last test flown was to certify the plane's takeoff capability with a single engine failure.  It was the first fatal accident involving an Airbus A330 as well as the first hull loss of the type.  It remained the only fatal accident involving an A330 until the crash of Air France Flight 447 on none }} .

Dennis L. Peck: Dennis L. Peck (born 1942) is an American sociologist and Emeritus Professor of Sociology at the University of Alabama, best known for his research on suicide, single-vehicle car accidents, and on learning to cope with the last moments of life.

Mary Jo Kopechne: 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.

Chappaquiddick incident: 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.

Southwest Airlines Flight 1248: Southwest Airlines Flight 1248 (WN1248, SWA1248) was a scheduled passenger flight from Baltimore-Washington International Airport, in Baltimore, Maryland, to Chicago Midway International Airport, in Chicago, Illinois, to Salt Lake City International Airport in Salt Lake City, Utah, and then to McCarran International Airport in Las Vegas, Nevada.  On December 8, 2005, the airplane slid off a runway at Chicago-Midway while landing in a snowstorm and crashed into automobile traffic, killing six-year-old Joshua Woods.  This is the first, and so far, only accident involving Southwest Airlines to result in a fatality.  It is also the first accident involving the airline to result in the death of someone not on the plane itself.

Tram accident: A tram accident is any accident involving a tram.  Alternatively, any accident involving a tram or a tram system may be considered a tram accident.  The latter definition is more commonly used in public safety studies.

Partnair Flight 394: Partnair Flight 394 was a chartered flight which crashed on 8 September 1989 off the coast of Denmark 18 km north of Hirtshals.  All 50 passengers and 5 crew members on board the aircraft perished, making it the deadliest civilian aviation accident involving an all-Norwegian airline company.  It was also the highest death toll of any aviation accident involving a Convair 580, and the biggest aeroplane accident in Denmark.  It was caused by use of unapproved aircraft parts in repairs and maintenance.

Wien Consolidated Airlines Flight 55: Wien Consolidated Airlines Flight 55 was a scheduled domestic passenger flight in Alaska that crashed into Pedro Bay on 2 December 1968, killing all 39 on board.  The Fairchild F-27B aircraft was operated by Wien Consolidated Airlines and was en route to Dillingham from Anchorage, with three intermediate stops.  The NTSB investigation revealed that the aircraft suffered a structural failure after encountering "severe-to-extreme" air turbulence.  The accident was the second-worst accident involving a Fairchild F-27 at the time, and currently the third-worst accident involving the aircraft.

Supporting paragraphs: Mary Jo Kopechne Chappaquiddick incident
Answer: Chappaquiddick incident