Thomas G. Alexander, 84, who retired in 1989 from the Food and Drug Administration as a supervisory analytical pharmaceutical chemist, died Oct. 28 at Montgomery Hospice’s Casey House in Rockville.

He died of congestive heart failure and respiratory failure, said his sister Alice King.

Mr. Alexander, a Silver Spring resident, joined the FDA after working as an Army chemist at Fort Detrick, Md., during the Korean War.

Thomas Goodwin Alexander was born in Washington and raised in Prince George’s County. He was a 1946 graduate of Hyattsville High School and a 1950 chemistry graduate of the University of Maryland. He received a master’s degree in chemistry from George Washington University in 1957.

He was a fellow of the Association of Official Analytical Chemists. He was a member and past treasurer of Oxon Hill United Methodist Church and a past treasurer of the Oxon Hill Food Pantry.

Mr. Alexander was active in the Boy Scouts and received its Silver Beaver Award. He also was a recipient of the Oxon Hill Lions Club’s distinguished service award.

He remained involved in community volunteer work after a stroke 18 years ago left him in a wheelchair.

His first wife, the former Eleanor Harkness, died in 1990 after 38 years of marriage. A stepson, Daniel Hoey, died in 2011.

Survivors include his wife of 21 years, Amy Hoey Alexander of Silver Spring; three children from his first marriage, Lyle Alexander of Disputanta, Va., Helen Nelson of Sharpsburg, Md., and Carol Fredericks of Clinton; three stepchildren, Cecelia Tillman of Kensington, Catherine Yanacek of Midland, Mich., and Michael Hoey of Berkeley, Calif.; two sisters, Alice King of Quincy, Calif., and Martha Alexander of Columbia, Mo.; 17 grandchildren; and three great-grandchildren.

— Adam Bernstein