David O. Sullivan, 88, the former deputy and acting chief of the CIA’s science and technology division, died of abdominal cancer July 18 at Allzwell Assisted Living Center in Chesapeake, Va. His son, David C. Sullivan, confirmed his death.

Mr. Sullivan worked 22 years for the CIA before retiring in 1980. He was awarded the agency’s Intelligence Medal of Merit.

After leaving the CIA, he commenced a 14-year career in real estate as a sales agent, broker and assistant office manager at Long & Foster in McLean.

David Oliver Sullivan was born in Alexandria and was a 1942 graduate of the old George Washington High School. During World War II, he served in the Army as a radio operator in a fighter squadron and participated in combat missions in the Pacific.

He worked at the Naval Research Laboratory and the Coast Guard Radio Laboratory after the war. He graduated from American University in 1950.

In 1994, Mr. Sullivan retired from Long & Foster and moved to Chesapeake.

He was a charter member of St. Paul’s Lutheran Church in Falls Church.

Survivors include his wife of 65 years, Mildred Lucille Carter Sullivan of Chesapeake; three children, Susan Sullivan Haymaker of Houston, Sherry Sullivan Ayres of Chesapeake and David C. Sullivan of Sterling; and seven grandchildren.

— Bart Barnes