A 21-year old Southwest Washington man was arrested yesterday and charged with homicide in the fatal beating earlier this month of an aide to Sen. Lloyd Bentsen (D-Texas), D.C. police reported yesterday.

The suspect was identified as Donnell L. Hurt, 21, of 229 L St. SW, and was described as a student at the University of the District of Columbia. He was arrested and charged after questioning at the offices of the police homicide unit.

The body of the victim, Kenneth R. Asbury, 34, a member of Bentsen's staff since 1973, was found on the morning of Nov. 2, in his blood-splattered second-floor efficiency apartment at 201 I St. SW.

Detectives gave no motive for the beating. Although they declined to say whether the suspect and victim might have been acquainted, they said they found no signs of forced entry into the victim's apartment.

Asbury's body was found in his second-floor apartment after he failed to call in or report for work the day before. Coworkers said they had last seen him on Oct. 30.

Dr. James L. Luke, the city's chief medical examiner, said Asbury had died of "multiple blunt-force trauma to the head and brain."

Asbury, a native of Glenoldan, Pa. who was described by friends and associates as a quiet and personable man, was hired by Bentsen nine years ago as a typist. He was later promoted to the position of secretary for legislative matters.

In a statement, the senator called Asbury "a faithful and longtime member of my staff," and termed his death a tragedy.

Hurt is to be arraigned today in Superior Court.