NPR's Howard Berkes reports that investigators at the Grand Canyon are no longer so quick to accept falling deaths at the national park as accidents. They are also reviewing past cases to see if there is any evidence of foul play. The change of policy is due, in part, to the case of Donna Spangler, who fell to her death in 1993. Although originally ruled an accident by authorities, Spangler's husband Bob has now admitted it was murder.
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