Obituaries of residents from the District, Maryland and Northern Virginia

Patrick J. McEvaddy, mathematician

Patrick J. McEvaddy, 63, a mathematician and scientific analyst at the John Hopkins University Applied Physics Laboratory for 31 years before retiring in 2009, died Feb. 20 at his home in the District. The cause was chronic obstructive pulmonary disease, said a brother, Hank McEvaddy.

Mr. McEvaddy was born in Brooklyn. During his tenure at APL, he worked on a satellite program that collected data for missile defense systems. He also was a lecturer at Johns Hopkins’s school of engineering.

Denise C. McQuighan, database engineer

Denise C. McQuighan, 55, a database engineer for defense and technology companies, died March 5 at her home in Gaithersburg. The cause was cancer, said her husband, Thomas McQuighan.

Denise Charrier was born in Cincinnati and moved to the Washington area in 1983. She had worked at what is now Lockheed Martin and other companies since 1984. She volunteered with political campaigns in Gaithersburg and with the Children’s Chorus of Washington.

John R. Heidemann, CIA analyst

John R. Heidemann, 92, who worked for the CIA from the early 1950s until his retirement in 1976 and who worked on the president’s daily intelligence briefing, died March 11 at a nursing home in Bethesda. He had coronary artery disease, said his daughter, Kris Heidemann.

Mr. Heidemann, a Chevy Chase resident, was born in Le Sueur, Minn., and served in the Army Signal Corps during World War II. He joined the CIA initially as an Asia specialist. His memberships included the Canoe Cruisers Association, whose newsletter he edited, and the Potomac Appalachian Trail Club.

— From staff reports