(Liberty Township)---A new report is out into the probable cause of a deadly plane crash in Liberty Township last September. The National Transportation Safety Board says the pilot of the plane failed to maintain control after the plane stalled during an aerobatic maneuver. The cause of the engine stalling could not be determined by investigators, as well who was at the controls at the time. The experimental plane bounced off one house and crashed into the backyard of another on Sunrise View Circle on September 20th of last year. The crash killed two brothers who were part owners of the plane, 40 year old Jeff Krummen and his 49 year old brother Steven.