Retired Army Maj. Edwin F. Laker, 70, a World War II veteran who later was a radio engineer for the CBS radio network and WTOP radio in Washington before retiring in 1971, died Saturday at Frederick Memorial Hospital in Frederick, Md., after a stroke.

During World War II, Maj. Laker served in Europe, where he participated in the development of the Path-finder long-range bombing system and served as a communications officer with the elite 82nd Airborne Division, a unit that helped spearhead the Normandy invasion.

Following the war, he worked for a brief time as a Pentagon communications director before rejoining CBS where he had been an engineer since 1937. He retired as an employe of The Washington Post Co., which had purchased the old WTOP television and radio stations from CBS.

Maj. Laker was a native of Baltimore. He attended Johns Hopkins University, George Washington University, and the Columbia Institute in Washington.

He helped establish WCAO, Baltimore's first broadcasting station, was a radar officer with a U.S. shipping line, and was chief engineer for a chain of radio stations on the West Coast before establishing his own company, Fidelity Sound.

He sold Fidelity Sound to CBS in 1937 and then joined the network as special events engineer that year.

Since retiring from radio work, he has lived in Ijamsville, Md., where he raised Angus cattle on his farm.

Survivors include his wife, Edna P., of Ijamsville; a daughter, Lowell Kendrick of Frederick; a brother, William H., of Lutherville, and one grandchild.