Seth L. Tuttle, 80, a retired research physicist who worked 25 years in the National Science Foundation’s astronomy division, died Aug. 8 at the Dove House hospice in Westminster, Md.

Last year, he became a quadriplegic after breaking his neck in a fall. He died of complications from his injuries, said his daughter, Samantha Eriksson.

Mr. Tuttle, a Bethesda resident, retired from the National Science Foundation in the mid-1990s. Earlier in his career, he was a research physicist at the University of Michigan’s Institute of Science and Technology in Ann Arbor.

Seth Lowell Tuttle was a native of Spokane, Wash. After Army service during the Korean War, he graduated in 1955 from the University of Washington with a bachelor’s degree in mathematics. He did graduate work in astronomy at the University of Michigan.

He was a resident of Bethesda’s Carderock Springs community and was a member of the Carderock Springs Swim and Tennis Club. He organized a monthly lunch for retired men in the neighborhood at Normandie Farm restaurant in Potomac.

His wife of 49 years, the former Dorothea Leonard, died in 2007. Survivors include two children, Russell Tuttle of Lakewood, Colo., and Samantha Eriksson of New Windsor, Md.; a sister; and four grandchildren.

— Adam Bernstein