The National Transportation Safety Board is investigating a deadly plane crash in Ennis over the weekend. Ennis police say a family of three were on board the twin-engine Cessna 310D aircraft when it went down on Saturday. One person died in the crash, and the other two were hospitalized in unknown condition. The family was reportedly visiting North Texas from out of town. The cause of the crash hasn't been determined, and the names of the people involved haven't been released.