Jay Nelson Stonebraker, 68, a retired intelligence research specialist at the Defense Intelligence Agency, died of pneumonia Aug. 27 at Physicians Memorial Hospital in LaPlata, Md. He had cancer.

Mr. Stonebraker, who lived in St. Charles, Md., was born in Carrollton, Mo. He graduated from the University of Iowa. During World War II, he served in the Army in Europe and received the Bronze Star Medal.

After the war, he went to work for the Army Signal Corps here. He joined the DIA when it was formed in 1963 and was a supervisor when he retired in 1974. He moved from Suitland to St. Charles in 1978.

After retiring, Mr. Stonebraker helped found the Maryland chapter of the Epigraphics Society, an organization for persons who decipher inscriptions. He was a member of the Pinefield Senior Citizens Association and the First Baptist Church in Waldorf.

His marriages to Sue Stonebraker and Marion Middleton Stonebraker ended in divorce. His third wife, Kathryn Stonebraker, died in 1976.

Survivors include his wife, Ellen of St. Charles; a daughter by his first marriage, Patty Waters of San Rafael, Calif.; four children by his second marriage, Alice Gray of Lanham, Dorothy Simmons of Clinton, Jon of Falls Church, and Jenny Hale of Wheaton; four stepchildren, Patricia Dishman of Olney, Celia Jones of Severna Park, Beverly Smith of North Carolina, and Royce Benson of Clinton; two brothers, Jack Y. Stonebraker of Florida, and Rev. J.W. Stonebraker of Riverdale, Ga., and 22 grandchildren.