At about 0948 Pacific time, the airplane collided with a 760-foot-tall radio transmission tower while in the traffic pattern at the Fullerton (Calif.) Municipal Airport. The Private pilot and passenger sustained fatal injuries; the airplane was substantially damaged. Visual conditions prevailed. Subsequently, a witness stated he observed the airplane flying low, in a westerly direction. He noted that the airplane was in a wings-level attitude and that the propeller appeared to be turning. The airplane continued towards two parallel towers, both of which had numerous guy wires attached. He observed the inboard section of the airplanes left wing collide with the taller tower, impacting about…