From left: Sens. Thomas Eagleton (D-Mo.), Marlow Cook (R-Ky.), Ted Stevens (R-Alaska), and Vance Hartke (D-Ind.) in 1971. (Henry Griffin/AP)

Marlow Cook, a Kentucky Republican who served one term as a U.S. Senator and then practiced law in Washington, died Feb. 4 in Sarasota, Fla. He was 89.

The cause was complications from a heart attack, said his daughter, Caroline Ely.

After an unsuccessful run for Kentucky governor in 1968, Mr. Cook was elected the next year to the U.S. Senate. He served one term before losing to then-Gov. Wendell H. Ford, a Democrat, in 1974.

Mr. Cook was the first Catholic to win a major statewide office in Kentucky, the Louisville Courier-Journal reported. He was master of ceremonies at Richard M. Nixon’s inauguration for his second presidential term in 1973.

Senate Majority Leader Mitch McConnell, a Republican, and U.S. Rep. John Yarmuth, a Louisville Democrat, each worked for Mr. Cook during his time in the Senate.

Mr. Cook retired to Florida about two decades ago but continued to occasionally weigh in on political matters.

In 2004, he announced that he would remain a Republican but was endorsing Sen. John F. Kerry (D-Mass.) for president because he opposed the Iraq War and certain Bush administration policies.

Marlow Webster Cook was born in Akron, N.Y., on July 27, 1926. After Navy submarine service in World War II, he graduated in 1950 from the University of Louisville law school and began practicing law in Louisville.

He served two terms in the Kentucky House of Representatives before being elected county judge in Jefferson County — which includes the city of Louisville — in 1961.

He married the former Nancy Remmers in 1947, and they had five children. A complete list of survivors could not immediately be confirmed.