Windsor W. Demaine Jr., 76, president of Demaine funeral homes in Alexandria and Springfield who had been a mortician in Northern Virginia for 55 years, died of congestive heart failure April 15 at the Circle Terrace Hospital in Alexandria.

Mr. Demaine was born in Alexandria and was a graduate of Columbia University. He served his internship in mortuary science at Bellevue Hospital in New York City.

In 1929, Mr. Demaine took over the family funeral business after both his father and grandfather died within a two-month period. He became the fourth generation of his family to operate the business, which was founded in 1841.

Mr. Demaine was on the original team of the old Alexandria Jud-naughts, a semipro football team. He was active in a number of civic and community organizations, including the Alexandria Boys Club and the Alexandria Sportsmen Club.

He was a past president of the Alexandria Kiwanis Club, which recently awarded him its Legion on Honor, the club's highest honor.

He was a life member of the advisory board of the Salvation Army, a past member of the Fairfax Council for the Performing Arts, and the Council of the Little Theatre of Alexandria. He was also a member of Christ Episcopal Church in Alexandria.

Survivors include his wife, Clova B. Demaine of Alexandria; a son, Windsor W. III of Alexandria; a stepson, F. L. (Mike) McGiffin of Wintergreen, Va.; a sister, Mrs. John A. Lannon of Alexandria; and six grandchildren.