Ivan L. Kestner, 86, a retired special agent in the Interior Department, died Dec. 8 of respiratory failure at Reston Hospital Center.

The death was confirmed by a daughter, Susan Kestner.

Mr. Kestner, a Sterling resident, began his career as an Army counterintelligence officer in 1955. Two years later, he joined the Interior Department. In the 1970s, he was sent to Micronesia to investigate money-laundering charges against government contractors.

He was a supervising special agent when he left the agency in 1980.

He then went into private consulting, focusing his work on federal security investigations, until the early 1990s.

Ivan Lee Kestner, a native of Madelia, Minn., was raised in Washington. He graduated from the old Capitol Page School in Washington and was presented his diploma by first lady Eleanor Roosevelt. While he was in high school, he worked as a Supreme Court elevator operator to help support his family.

He graduated from Florida State University in 1952. He then worked as an investigator at the Civil Service Commission in Washington.

Mr. Kestner was a World War II veteran and served in the Navy Seabees from 1944 to 1946.

He was a member of Cameron United Methodist Church in Alexandria, where he sang bass in the choir. He was also a member of the American Legion in Springfield and volunteered with the Fairfax County Police Department in Franconia.

Survivors include his wife of 59 years, Charline Weitmon Kestner of Sterling; three children, Scott Kestner of Reston and Susan Kestner and Theresa Galambos, both of Sterling; a sister, Ruth Wagoner of Greensboro, N.C.; a brother, Wayne R. Kestner of Ellicott City; and five grandchildren.

— Megan McDonough