Ms. Menendez had been charged with her husband, Robert Menendez, a former New Jersey senator convicted in July of trading his political influence for gold, cash and a Mercedes-Benz.

Senator Robert Menendez of New Jersey is accused of a wide-ranging international bribery conspiracy. Jurors are likely to begin deliberating next week.

Mr. Oliver’s two young daughters and a pilot were also killed in the crash, the police in the Caribbean nation of St. Vincent and the Grenadines said on Thursday.