Father Donald F. Diederich, a retired priest of the Rockville Centre Diocese, L.I., died Jan. 15.
For many years, he was a member of the faculty of Immaculate Conception Seminary, Huntington.
A Mass of Christian Burial was celebrated Jan. 21 at St. James Church, Setauket, L.I.
Burial was in St. Charles Cemetery, Farmingdale, L.I.
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