Thomas Leonard (Hap) Fore Jr., 57, a tax analyst with Newmyer Associates Inc., a public relations and business counseling firm, was found dead Thursday at his home in Washington. The D.C. medical examiner's office said he died of an apparent heart ailment.

In addition to his work, Mr. Fore took part in many church activities. He was a member of the First Baptist Church and its chorus and had been associated with a number of church-sponsored programs in the inner city, including Bread for the City and the old Uplift House. He had attended a meeting at the First Baptist Church the night before his body was found.

Mr. Fore also was a member of the Washington Chamber Music Society.

He had been with Newmyer Associates since 1960. He specialized in analyzing tax legislation for the firm's clients.

Mr. Fore was born in Happy, Tex. He graduated from Hardin-Simmons University and was in the Navy during World War II. He then went back home to Happy, where he served three terms as the town's mayor and worked in a family-owned automobile dealership.

In 1956, he moved to Washington to work in the unsuccessful presidential campaign of Gov. Adlai E. Stevenson of Illinois, the Democratic candidate that year. He was the administrative assistant of former representative Walter Rogers (D.-Tex.) from the end of the political campaign until joining Newmyer.

Survivors include a sister, Joan Mapes of Houston, and a brother, William E., of San Antonio, Tex.