his death, David was in Palm Beach to see his grandmother, who had just had a stroke. December 31, 1997 – Michael LeMoyne Kennedy died in a skiing accident after crashing into a tree in Aspen, Colorado. July 16, 1999 – John F. Kennedy Jr. died when the plane he was piloting crashed into the Atlantic Ocean off the coast of Martha's Vineyard, Massachusetts. The crash was attributed to pilot error and spatial disorientation. His wife and sister-in-law were also on board and died. September 16, 2011 – Kara Kennedy died of a heart attack while exercising in a Washington, D.C. health club. Kara had reportedly suffered from lung cancer nine years earlier, but she had recovered after the removal of part of her right lung. May 16, 2012 – Mary Richardson Kennedy died by suicide on the grounds of her home in Bedford, Westchester County, New York. August 1, 2019 – Saoirse Roisin Kennedy Hill, granddaughter of Robert F. Kennedy, died of an accidental drug overdose at the Kennedy Compound in Hyannis Port, Massachusetts on Cape Cod. April 2, 2020 – Maeve Kennedy McKean disappeared with her eight-year-old son, Gideon, during a short canoe trip in the Chesapeake Bay. Maeve's body was found by divers four days later. Gideon's body was found two days after hers, on April 8. Authorities believe Maeve paddled to retrieve her son's ball, leading the wind and current to overturn the canoe. Other incidents November 1941 – Rosemary Kennedy, age 23, struggled to read and write, and she suffered from mood swings, seizures, and violent outbursts. During birth, Rosemary was deprived of oxygen as her mother and nurse waited for the doctor to arrive. As she grew older, she became more rebellious and the family worried she would do something that could tarnish the Kennedy reputation. In an attempt to cure or treat his daughter, Joseph Kennedy secretly arranged for her to undergo a prefrontal lobotomy, which was seen as a promising treatment for various mental illnesses. Instead of saving Rosemary, the now-discredited procedure left her mentally and physically incapacitated. Rosemary remained institutionalized in seclusion, in rural Wisconsin, until her death in 2005. Her family remained distant for most of Rosemary's life, but Eunice Kennedy Shriver, her sister, grew close with Rosemary later in life. Eunice went on to found the Special Olympics and the Joseph P. Kennedy Jr. Foundation which researches developmental and