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Assassinations, suicide, overdose: a Kennedy curse?

President John F. Kennedy (right) and his brothers Attorney General Robert F. Kennedy (left) and Senator Edward Moore Kennedy outside the Oval Office at the White House on August 28, 1963"The Kennedy Curse Strikes Again," British newspaper the Independent declared when a daughter-in-law of Bobby Kennedy committed suicide last year. It was a nod to the idea that the most closely-watched American family -- sometimes likened to American royalty -- have been struck by enough calamities that they could star in a Greek tragedy.