Well looks like the reason the death was in Washington D.C. was probably because of his Air Force Connection.
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Fort Sam Houston National Cemetery
H's = 6,455 decedents
Name, Date of interment, Rank/Branch of Service, Section, Grave
HASTEY, JOHN C, 12-08-95, MSGT/USAF, 16, 2524
HASTEY, MARGARET M, 09-23-74, COL/USAF, W, 3320
HASTEY, THOMAS W, 06-29-64, COL/USAF, W, 3320
HASTEY, THOMAS W JR, 05-26-71, 2LT/USA, W, 3313
I'll bet you can contact these people for more information.