(AP) - Michael Arnold, 59, of Lorton, was a Navy veteran and avid pilot who was building a light airplane at his home, said his uncle, Steve Hunter.
"It would have been the first plane he ever owned," Hunter said in a telephone interview from Rochester, Mich., Arnold's hometown. "It's partially assembled in his basement."
Hunter said his nephew retired from the Navy as a commander or lieutenant commander and had previously been stationed at Pearl Harbor in Hawaii. He worked at the Navy Yard on a team that designed vessels such as the USS Makin Island, a Wasp-class amphibious assault ship used by the Marine Corps.
Arnold and his wife, Jolanda, had been married for more than 30 years, Hunter said. They had two grown sons, Eric and Christopher.
Hunter said Arnold returned to Michigan for Labor Day to visit his 80-year-old mother, Patricia.
"He was a loving son of his mother and his wife, and great father to his kids," said Hunter. "It's tragic. How can you get up in the morning and go to work and have that happen? How do bad things like that happen to good people?"