At about 12:35 EDT, a Beech N35 broke up in flight and crashed near Conicville, killing the pilot and passenger. The IFR flight was en route from Caro, Mich., to Newport News, Va., at 9,000 feet when the pilot reported an electrical failure. The pilot then radioed the controller again and stated that he had experienced a gyro failure. The controller then observed the airplane enter into a high rate of descent on the radar screen. The alternator belt was found loose about the alternator housing and the pulley wheel attached to the engine accessory drive case. The vacuum pump had a sheared drive shaft.