NTSB initial report says Wal-Mart heir John Walton reported no problems before fatal crash.
An early report from federal investigators sheds little light on what caused John Walton's plane to crash in Wyoming last month. The National Transportation Safety Board says the Wal-Mart heir was in radio contact with traffic controllers just before the wreck and reported no problems.
The report says witnesses saw his plane go into a deep descent and hit short of the runway at the Jackson Hole Airport in Grand Teton National Park. Investigators found no immediate sign of structural failure or mechanical problems.