Michael_J._Adams--Joe_Henry_Engle

Michael James Adams (May 5, 1930 – November 15, 1967) (Maj USAF) was an American aviator, aeronautical engineer, and USAF astronaut. He was one of twelve pilots who flew the North American X-15, an experimental spaceplane jointly operated by the Air Force and NASA.
On November 15, 1967, Adams flew X-15 Flight 191 (also known as X-15 Flight 3-65-97) aboard the X-15-3, one of three planes in the X-15 fleet. Flying to an altitude above 50 miles, Adams qualified as an astronaut according to the United States definition of the boundary of space. Moments later the craft broke apart, killing Adams and destroying the X-15-3. He was the first American space mission fatality by the American convention.