Carl Williams Kelley, 95, a chemist who worked for 20 years for the Interior Department before retiring in 1975 as chief of the division of petroleum chemistry, died of sepsis Jan. 8 at his home in Roanoke, Va. A former University Park resident, he lived in Roanoke for the past six months.

Prior to his work for the Interior Department in Washington, he was a senior staff engineer at Shell Oil Co.'s headquarters in New York City and a Navy chemical engineer during World War II.

Mr. Kelley was a native of Durham, N.C. He graduated from the University of North Carolina at Chapel Hill in 1927 and received a master's degree in chemistry from North Carolina State University in Raleigh. He received a doctoral degree in chemistry from the University of Maryland.

Active in civic organizations, he served on the University Park town council in the 1960s and chaired the Prince George's County chapter of the Salvation Army. He was a senior warden of St. Andrew's Episcopal Church in College Park and past president of the College Park Rotary Club.

Survivors include his wife of 57 years, Margaret Holmes Kelley of Roanoke; two daughters, Charlotte K. Porterfield of Roanoke and Margaret K. Miles of Pittsburgh; and four grandchildren.