David M. Brown

David McDowell Brown (April 16, 1956 – February 1, 2003) was a United States Navy captain and a NASA astronaut. He died on his first spaceflight, when the Space Shuttle "Columbia" (STS-107) disintegrated during orbital reentry into the Earth's atmosphere. 
Brown became an astronaut in 1996, but had not served on a space mission prior to the "Columbia" disaster. Brown was posthumously awarded the Congressional Space Medal of Honor.