Cause of Death Revealed for Saoirse Kennedy Hill

Saoirse Kennedy Hill, right, granddaughter of Ethel Kennedy and her late husband Robert F. Kennedy, holds a relative's baby before a ceremony for naming the Robert Kennedy Navy Ship at the John F. Kennedy Presidential Library, in Boston on Sept. 20, 2016. AP Photo/Elise Amendola

The granddaughter of former Sen. Robert F. Kennedy, Saoirse Kennedy Hill, died of an accidental drug overdose, it was reported Friday.

The Boston Herald and WCVB-TV reported that Hill, 22, had methadone, fluoxetine, norfluoxetine, diazepam, nordiazepam, and alcohol in her system at the time of her death in August.