Dwight D. Eisenhower:

That evening, Eisenhower's body was placed onto a train en route to Abilene, Kansas, the last time a funeral train has been used as part of funeral proceedings of an American president. His body arrived on April 2, and was interred later that day in a small chapel on the grounds of the Eisenhower Presidential Library. The president's body was buried as a General of the Army. The family used an $80 standard soldier's casket, and dressed Eisenhower's body in his famous short green jacket. His only medals worn were: the Army Distinguished Service Medal with three oak leaf clusters, the Navy Distinguished Service Medal, and the Legion of Merit. Eisenhower is buried alongside his son Doud, who died at age 3 in 1921. His wife Mamie was buried next to him after her death in 1979.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". When did Mamie Eisenhower die?
1979