He was born in Fulton, a son to the late Metro and Anna Diak, and lived all his life in Fulton.
He was an Army veteran of World War II. He was a delivery man for Canada Dry, Dorsey Beverage Company and for Onondaga Beverage, where he retired from in 1985.
He was a member of Teamsters Local #1149, Baldwinsville, and the Mattydale American Legion.
He was a deacon at the former First Congregational Church in Fulton.
In addition to his parents, he was predeceased by his wife, Rose M. Diak, who died March 19, 2010; two sisters, Mary Sackett and Kate Best; and five brothers, Nicholas, John, Stephen, Joseph and Michael Diak.
He is survived by two sons, Douglas and Dennis (Patty) Diak, both of Fulton ,as well as several nieces and nephews.
Funeral services were held Tuesday at Foster Funeral Home, Fulton. Burial was in Mount Adnah Cemetery. Calling hours were held Monday at the funeral home.
Contributions may be made to the American Heart Association, Founders Affiliate, P.O. Box 3049, Syracuse, NY 13220-3049.