At 07:05 central time, a Beech 58 crashed about a half mile north of the Ainsworth Municipal Airport, killing the pilot and leaving the passenger seriously injured. The Part 135 cargo flight was en route to Valentine, Neb., when it encountered icing conditions and the pilot elected to divert to Ainsworth. While on approach to runway 17, the airplane struck the ground on a heading of 280 degrees. The aircraft was carrying radioactive medical materials and on-site investigation did not began approximately until about 72 hours later.