Opening arguments were presented late yesterday in the Montgomery County Circuit Court trial of Donovan George Brown, 21, of Jamaica, who is charged with murder in the Dec. 3, 1984, slaying of George F. Lewis, 30, of 6422 Eighth St. NW.

Lewis' body was found by construction workers at a project in the Burtonsville area of the county, according to prosecutors.

Assistant State's Attorney Ann S. Harrington told the jury that Lewis was killed by a gunshot in the head in a Silver Spring apartment, wrapped in a rug, and driven to the construction site and dumped. She said that Brown killed Lewis because Lewis had robbed one of Brown's drug dealers.

Defense attorney Paul DeWolfe said that Brown is innocent of the murder charge. He said that all of the "major characters in this case are in drugs . . . . All are of Jamaican descent."

DeWolfe said that the prosecution's case against Brown is based primarily on the testimony of Earl (Jackie) Wallace.

Wallace initially was charged with murder, DeWolfe said, but Wallace agreed to testify against Lewis and plead guilty to drug distribution and maintaining an apartment where drugs were sold, if the government would drop the murder charge.

Wallace is expected to testify today.