FILE - President Barack Obama awards Ethel Kennedy the Presidential Medal of Freedom, Monday, Nov. 24, 2014, during a ceremony in the East Room of the White House in Washington. (AP Photo/Jacquelyn Martin, File)

FILE - From left, Dolores Huerta, labor leader and civil rights activist, Ethel Kennedy, and civil rights leader Rep. John Lewis, D-Ga., are applauded during the Robert F. Kennedy Human Rights Award ceremony on Capitol Hill in Washington, Tuesday, June 5, 2018. (AP Photo/J. Scott Applewhite, File)

FILE - Ethel Kennedy, left, and her daughter Kerry Kennedy attend the Robert F. Kennedy Ripple of Hope Award ceremony, Tuesday, Dec. 16, 2014, in New York. (AP Photo/Jason DeCrow, File)

FILE - Navy Secretary Ray Mabus smiles with Ethel Kennedy, widow of Sen. Robert F. Kennedy, at the naming of the Robert F. Kennedy Navy Ship at the John F. Kennedy Presidential Library, Tuesday, Sept. 20, 2016, in Boston. Ships in this class are being named in honor of civil and human rights heroes. (AP Photo/Elise Amendola, File)

FILE - Ethel Kennedy, left, subject of the HBO documentary "Ethel," poses for a portrait with her daughter Rory Kennedy, the director of the film, Wednesday, Aug. 1, 2012 in Beverly Hills, Calif. (Photo by Chris Pizzello/Invision/AP, File)

FILE - Sen. Edward Kennedy, from left, first lady Hillary Rodham Clinton, President Bill Clinton and Ethel Kennedy, right, listen to a remembrance delivered by Rep. Joseph P. Kennedy II during a memorial Mass in honor of Robert F. Kennedy on the 25th anniversary of his death at the Arlington National Cemetery in Arlington, Va., June 7, 1993. (AP Photo/Marcy Nighswander, File)

FILE - Ethel Kennedy holds her new son, Douglas Harriman Kennedy, with two-year-old Christopher Kennedy, right, as they leave Georgetown University in Washington, April 13, 1967, for home. (AP Photo/Henry Burroughs, File)

FILE - Sen. Edward Kennedy, back, stands behind the widow of former Senator Robert F. Kennedy, Mrs. Ethel Kennedy, second left, with her five children, and his wife Joan, right, as they pause at the grave of assassinated President John F. Kennedy in Arlington National Cemetery, Nov. 20, 1970, in Arlington, Va. (AP Photo/Bob Daugherty, File)