Charles David Thomas Lennhoff, 70, a retired Army lieutenant colonel who later practiced law in Springfield, died of cancer Dec. 28 at his home in Fairfax.

Col. Lennhoff was born in Hartford, Conn., and graduated from the U.S. Military Academy at West Point. While serving in the Army he received a degree at Harvard Law School. In 1951 he helped negotiate agreements permitting the United States to station military forces in Iceland.

He drafted military agreements with the Spanish government in 1952 and 1953, and in 1956 and 1957 he was judge advocate for the Seventh Division in Korea.

Col. Lennhoff retired from the Army in 1960 after 25 years of service, and since then he had practiced law in Springfield with the firm of Downey & Lennhoff.

He was a member of the St. Ambrose Catholic Church in Fairfax and the Father Dimond Council of the Knights of Columbus, where he had been grand knight.

Survivors include his wife, Nancy, of Fairfax; three daughters, Barbara Lennhoff of Boston, Anne Dodd of Columbia, Md., and Catherine Lennhoff of Pittsburgh; three sons, David, of Darnestown, Md., Thomas, of Fairfax, and Stephen, of London; a brother, John, of West Hartford, Conn.; a sister, Helen Cole of Calverton, Va., and six grandchildren.