There was a little more info at http://www.mcall.com/news/local/all-b1_2plane-3r.5898453jun14,0,6384556.story

"He was flying under visual flight rules..."

That means no instruments, in heavy fog. Dumb.

"...another neighbor who heard the engine 'cut out and said there was no sound after that.' "

Water in the gas. Betcha a nickel.

Sue