CHEYENNE, Wyo. (AP) — Federal investigators say a twin-engine plane broke up in flight before crashing in southwest Wyoming last month, killing the only person aboard.

A National Transportation Safety Board preliminary report dated April 20 does not say why the plane broke up. The report says there were no witnesses.

The April 12 crash killed Cranfill "Buster" High of Winnemucca (wihn-uh-MUHK'-uh), Nev.

The wreckage of his Cessna 320D was found about 22 miles southwest of Green River. Authorities say debris was strewn over an area about 1,000 yards long.

Authorities say High took off from Sidney, Neb., en route to Riverton, Wyo., where he had family. A relative told authorities he changed his mind while flying and headed toward Nevada instead.