The amphibious airplane was substantially damaged at about 1600 Central time when it nosed over while performing a water landing. The pilot sustained minor injuries; the passenger was fatally injured. Visual conditions prevailed. According to the pilot, the airplane touched down “with no skips or bounces” and quickly nosed over and began to fill with water. The pilot attempted to kick the doors open, but was unable. When asked about the position of the landing gear before landing, the pilot responded he did not remember. A witness observed the airplane flipping over and reported that approximately two minutes later she could only see the wheels and the bottom of the airplane extending out of the water.