Robert F. Kennedy’s granddaughter, Saoirse Kennedy Hill, places a flower at the Eternal Flame, President John F. Kennedy’s gravesite in Arlington, Va., in 2000. Hill died Thursday at age 22.

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Robert F. Kennedy’s granddaughter, Saoirse Kennedy Hill, places a flower at the Eternal Flame, President John F. Kennedy’s gravesite in Arlington, Va., in 2000. Hill died Thursday at age 22.