Federal safely investigators have determined that pilot error was the probable cause of a fiery crash at a 2013 Ohio air show that killed a wing walker and pilot in front of thousands of horrified spectators. The Boeing Stearman biplane crash killed 45-year-old wing walker Jane Wicker and 64-year-old pilot Charlie Schwenker, both Virginia-based performers, at the Vectren Dayton Air Show on June 22, 2013. The Dayton Daily News reports that the National Transportation Safety Board concluded the pilot attempted to fly "a modified airshow maneuver, which placed the airplane at low altitude and airspeed and out of position within the performance area." The findings follow an initial Ohio State Highway Patrol investigation in July 2013 that also attributed the cause of the crash to pilot error.