A Southeast man pleaded guilty yesterday in U.S. District Court to a charge of attempting to influence a juror in a trial in November in which his sister was charged with heroin distribution conspiracy, according to the U.S. attorney's office.

Timothy C. Jones, 25, of 101 Ridge Rd. SE, pleaded guilty before U.S. District Judge Gerhard A. Gesell. Jones was charged after a juror deliberating in the case involving his sister testified that Jones had followed her home and offered to give her anything to learn the outcome of the jury's first session. She testified that she refused to talk to him and ran into her house.

The judge in that case, U.S. District Judge Joyce Hens Green, turned down motions for a mistrial, and the jury reached its verdict six days later.

Yesterday, Green sentenced Jones' sister and three other defendants in that case.

The sister, Sharon Jones, 31, also of 101 Ridge Rd. SE, who had been acquitted of the drug charge but found guilty of federal firearms charges, was sentenced to five years in prison and fined $10,000. Her former companion, Robert L. Bullock, 35, of 1617 Ridge Place SE, who was found guilty of the same charge, received the same sentence.

Steve Fafowora, 38, of Miami, who was convicted of racketeering and heroin distribution conspiracy in a scheme to buy five kilograms of heroin from an undercover D.C. police officer, was sentenced to 15 years, with a special five-year supervised release term to follow.

Olufonso A. Yussef, 29, of 5800 Annapolis Rd., Bladensburg, who also was convicted of heroin distribution conspiracy, was sentenced to 10 years without the possibility of parole.