NEW INFORMATION: Investigation of crash that killed Menomonie pilot could take another week to finish

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WAUSAU, Wis. (WEAU) -- We may not know what caused the plane crash that killed a Menomonie pilot for another week.

On Sunday, William Cowden, 47, died when his plane crashed in the woods. He was doing an aerial maneuver during an airshow in Stevens Point. WSAW-TV in Wausau reports that the National Transportation Safety Board plans to review GPS, a Go-Pro camera, and log books. The NTSB says some of the log books were written in Russian, so analyzing it could take longer. The evidence will go to Washington D.C. The wreckage is being kept in a private hangar during the investigation.

Police say Cowden was the owner and sole pilot of the plane.