Dr. Don Hayworth, 84, a former government consultant and educator who was a Democratic representative from Michigan's sixth district from 1955 to 1957, collapsed and died Feb. 25 while walking near his home in Southwest Washington. A spokesman for the D.C. Medical Examiner's office said he died of arteriosclerotic heart disease.

Dr. Hayworth came to Washington in 1941 and was head of the speakers bureau in the Office of Civil Defense from 1942 to 1943. He then was liaison officer with the states on fuel conservation with the Interior Department.

He was an unsuccessful candidate for Congress in 1952 but defeated Rep. Kit Clardy (R-Mich.) two years later. Dr. Hayworth was himself defeated in his reelection bid in 1956. He was a consultant with the Agriculture Department from 1963 to 1964 and with the Social Security Administration from 1965 to 1967.

Dr. Hayworth was a 1918 graduate of Grinnell College in his native Iowa. He earned a master's degree at the University of Chicago and a doctorate in speech at the University of Wisconsin. He was a member of the faculty of Michigan State University from 1937 until retiring in 1963. During this time he had been a full professor and chairman of the school's speech department.

In recent years he traveled to mainland China and the Soviet Union and was writing a book on philosophy.

Survivors include his wife, Frances of Washington; three daughters, Barbara Lawther of Ionia, Mich., Francene Polidori of Dearborn, Mich., and Donna Hill of Laurel; a brother, Kenneth of Montezuma, Iowa, and eight grandchildren.