Harmon M. Bethea Jr., 29, who was found shot to death Sept. 19 in his parked car in Southeast Washington, was a technical planner with the Fairfax County Office of Comprehensive Planning.

He had been with the county agency since 1973.Before that he had been an administrative assistant in the office of community education at the University of D.C., where he received a bachelor of arts degree in city and regional planning.

A suspect has been charged with murder. Washington homicide detectives said a motive has not yet been established.

Mr. Bethea was born in Washington and was a graduate of McKinley High School. He had been a aide to Rep. Frank Thompson Jr. (D-N.J.), a consultant to Affiliated Enterprises Inc. and to the 14th Street Area Project Area Committee.

Mr. Bethea also had studied broadcasting journalism. He was a station manager at WWTI radio and cable television at the University of D.C. and a production assistant with Black News on WTTG-TV.

He was a member of St. Anthony's Catholic Church.

He is survived by his wife, Esther Wilson Bethea of the home in Washington, and his parents, Harmon M. and Ruth Ann Bethea, also of Washington.