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?
Sentence (from "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.
Relevant evidence: Yes