A Loudoun County jury deliberated for the second consecutive day yesterday without reaching a verdict in the trial of American University official William (Bull) Evans-Smith on a charge of murdering his wife.

The jurors were dismissed by Judge Carleton Penn after 10 hours of deliberations and told to return to the Leesburg courthouse at 9:30 a.m. today.

The prosecution maintains that Evans-Smith, 65, strangled his 64-year-old wife Barbara on April 15 at their Crooked Run Farm near Hamilton, Va., and then made it appear she had been raped and the house burglarized.

A medical examiner has testified that the victim was not raped; the defendant, who has said he is not guilty, has testified that his wife of 43 years was still alive when he left for his job as director of AU's Foreign Area Studies program on the day she was killed.

The jury of four women and eight men, which was escorted in and out of the courthouse yesterday by sheriff's deputies, was instructed by Penn to decide whether Evans-Smith was guilty of first- or second-degree murder or not guilty. If convicted of first-degree murder, Evans-Smith could receive 20 years to life. On the second-degree murder charge he could receive five to 20 years.

Defense attorney Blair D. Howard said yesterday that the jury was doing "a conscientious job."