His wife , Joan died on July 28 , 1999 and is buried next to him .
Voll died on September 12 , 1987 , and is buried at the Massachusetts National Cemetery .
Voll 's wife , Joan died on July 28 , 1999 and is buried next to him .
Voll died on September 12 , 1987 , and is buried at the Massachusetts National Cemetery .