Ervin Singletary, 67, chief cook at the Old Heidelberg Rathskeller Restaurant in Washington, where he worked for 37 years before his retirement in 1979, died at his home in Washington on Sunday following a heart attack.

Mr. Singletary, who was born in Kingstree, S.C., came to Washington in 1937 and studied upholstery at the Margaret Murray Washington Vocational School. He began his career at the Old Heidelberg in 1942. For many of his years there, he also worked part-time as a caterer.

A member of the John Wesley AME Zion Church in Washington since 1937, Mr. Singletary was a member of the Stewards Board, vice president of the Men's Senior Usher Board, president of the March Birthday Club and treasurer of the Loyal Friendly Circle. He also was one of the church's Class Leaders, persons who look after members of the church who are ill or otherwise in need of assistance.

In addition, Mr. Singletary was a member of the Interdenominational Church Ushers Association. He was an instructor in the organization's school of ushering, of which he also was the reporter, and a member of its courtesy committee and the treasurer of its publicity committee.

Survivors include his wife, Dollie L., of Washington; a stepdaughter, Willie L. Beale also of Washington; 11 sisters, Nancy Cooper, Janie Gamble, Eula Wallace and Mary Murry, all of Kingstree, Margarite and Pearle Singletary, Mary W. Woodward and Lottie Duke, all of Washington, Jimmie Salters and Flossie Singletary, both of New Haven, Conn., and Melinese Burroughs of Baltimore; five brothers, Wilbur and Robert Singletary of Washington, Charlie and A. J. Singletary of Kingstree, and Samuel J. Singletary of Springfield, Ohio; one grandson, and one great-grandson.

The family suggests that expressions of sympathy be in the form of contributions to the Building Fund, John Wesley AME Zion Church, c/o Elnora Askey, 5227 2nd St. NW, Washington, D.C., 20011.