Mary L. Frechtling, a saleswoman who worked with the Beauty Counselors cosmetics company for nearly four decades until her retirement in 1995, died Sept. 9 at her home in Bethesda. She was 98.

The cause was coronary atherosclerosis, said her son Doug Frechtling.

Mary Louise Porch was a native of Littleton, Colo., and a 1937 biology graduate of Vassar College in Poughkeepsie, N.Y. She then was a research laboratory technician at the James Buchanan Brady Urological Institute, associated with the Johns Hopkins medical institution in Baltimore.

She settled in the Washington area in 1942 and was a longtime Bethesda resident.

Her husband of 60 years, Louis E. Frechtling, died in 2000. Survivors include two children, Doug Frechtling of Bethesda and Susan Stewart of Cabin John, Md.; a sister; a grandson; and three great-grandsons.

— Emily Langer