Henry J. Kronlage, 49, whose body was found in some underbrush a half-mile beyond the finish line of Sunday's 10-mile foot race in Herndon, was an engineer with the IBM Corp.

He disappeared during Sunday's race. Police said Mr. Kronlage apparently suffered heatstroke and may have become delirious when he missed a large sign pointing to the community center where the race ended.

Patrick Reiley, 31, another runner, also died during the race. Both men were the subject of extensive searches. Mr. Kronlage had been jogging five to six miles a day for more than five years, according to a family friend. f

Mr. Kronlage was a native of New Orleans and earned a bachelor's degree in physics at Loyola University there. He earned a master's degree in applied mathematics at Adelphi University in Garden City, N.Y., and a master's degree in applied physics at Hofstra University in Hempstead, N.Y.

He served in the Army in the mid 1950s and worked as an engineer in New York before moving to Fairfax in 1966. He worked as a staff engineer for TRW here before joining IBM in Manassas about seven years ago.

For the past 13 years, Mr. Kronlage had helped coach softball, Little League, basketball, and soccer teams for youths in Fairfax. He also had been active in the Boy Scouts and the Indian Guides. He had been a member of IBM's softball team.

He was a member of the Holy Spirit Catholic Church in Annandale.

Survivors include his wife, the former Anne Weingart, a daughter, Lynne Marie, and three sons, Ronald Stephen, James Edward, and Karl Joseph, all of Fairfax; his mother, Martha Flannagan, two sisters, Colette Mittelstaedt and Marie Lobre, and a brother, Camillus, all of New Orleans, and two other brothers, Rene Jr., of St. Louis, and John William, of Richardson, Tex.

The family suggests that expressions of sympathy be in the form of contributions to the Holy Spirit Catholic Church's fund for Haitian relief, 8800 Braddock Rd., Annandale, 22003.