Kevin Thomas Ryan, 70, founder and coowner of the MV Construction Corp., a concrete subcontracting firm in Crofton, died Tuesday at his home in Bowie following a stroke.

Mr. Ryan began in the construction industry during World War II when he was a labor supervisor for the Work Projects Administration during the construction of the Pentagon. He then served in the Merchant Marine in the North Atlantic and South Pacific. Following the war, he served as an assistant chief architect with the Federal Housing Administration.

In 1959, he founded his own company after working as a construction supervisor in Maryland for a number of years. He retired in 1964.

A native of New York City, Mr. Ryan came to this area with his family at an early age. He graduated from Laurel Senior High School in 1925. The following year, he enlisted in the Coast Guard.

He was a longtime resident of Bowie and was active in the Knights of Columbus there.

Survivors include his wife of 50 years, Evelyn Moore Ryan, of the home; three sons, Kevin T. Jr., of San Antonio, Tex., Patrick M., of Davidsonville, Md. and Timothy J., of Huntingtown, Md.; two brothers, John F., of Sterling, Va., and Michael J., of Chevy Chase, and six grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Church of the Ascension building fund in Bowie.