The autopsy report showed that Trudy Doyle "died immediately from one of the two" bullets that entered her chest on the morning of Dec. 1.

The question before the mock jury was whether or not her boyfriend, John Diamond, had intentionally killed her. Was he guilty of first-degree murder, or had it been an accident?

Seven "jurors" sat in Courtroom 17 of D.C. Superior Court Saturday and heard prosecutors from the U.S. Attorney's Office argue that Doyle's "death" was premeditated and that Diamond entered the Truckstop Cafe that morning with the intention of leaving with Doyle - or making sure that Doyle never left with anyone else.

The defense at the mock trial maintained that it was an accident. Diamond - who, until that morning, was a police officer - approached Doyle, and she pulled his revolver from the waist-band of his pants, according to the defense. At that point he tried to take the gun away from her, and it went off.

"I was shocked. My muscles tensed, and then the gun went off again," Diamond testified.

After the closing arguments, Judge William Pryor warned the jurors that it was the burden of the prosecutors to prove that the murder had been premeditated.

"If you're not sure, then (the prosecutors" haven't proven it beyond a reasonable doubt" and the jury should find the defendant innocent, Pryor told them.

No verdict was reached. None had been requested. The mock trial, part of the Community Law Fair, was held to show the public what a criminal trial is like.

Five of the jurors were Cub Scouts from Potomac, Md., who had come to the fair with Troop 1090 den leader William Malome as an activity "in connection with (the scouts') Citizen Activity Badge."

"I think it was pretty neat sitting there, learning how lawyers do their thing," said John Sweeney, 11.

Brian Westrick, 10, thought that it was "fun," and a lot tamer than the trials he had seen on television. "On TV they get up and yell a lot more," he said.

While the murder trial was taking place, District public school students were arguing an adoption case before Judge Paul Webber in a courtroom down the hall. Outside the Superior Court Building, music and exhibits filled Judiciary Square.

More than 50 tables, representing legal organizations, government offices and civic groups, were scattered about the square. The people manning the tables informed the public about services their organizations provided.

Sponsored by a coalition of bar associations, courts and civic and political seemed to offer something for every one - legal advice, police canine demonstrations, a hot air balloon, jazz and gospel groups, skits, contests and a mock legislative session by the District Council.

During most of the day, however the organization representatives and entertainers far outnumbered the people who had come to gather information and be entertained.

"It's the first time out. People didn't know what it was. . . and they're missing a good thing," said fair coordinator Karen Sherman.

She said the fair offered help in several areas including immigration, employment criminal law, bankruptcy, consumer affairs and landlord-tenant problems, she said.

At the Lawyer's Arcade, attorneys offered general advice on these and other matters. "I would like to see more people," said Wendell W. Webster, the lawyer at the bankruptcy table. But "if you can help somebody - one or two people - at a community fair like this, it's worthwhile."

Webster said he had talked to a woman who was considering bankruptcy and, after listening to her situation, told her she wasn't at the point where declaring bankruptcy was the only option.

"I could see from the look on her face that she felt relieved," he said.

Among the competitions was the final round of a speech contest on the topic "Our Changing Rights: Making the System Work for You," which was open to all public high school students in the District.

The prize, a $1,500 college scholarship, was split. Derrick Ward, from Woodson Senior High School, and Evelyn Griggs, from first place. Ward's speech, "If Only I Had Known," focused on consumer issues. Griggs won for "Discrimination in Today's Society." CAPTION: Pictures 1 and 2, Representatives of legal groups, above, inform visitors of their services at the Community Law Fair. At right, attorney Ilene Price puts a first-place ribbon on the winning entry in a poster contest for elementary students while Dawn White, of the Washington Bar Association, checks the list of contestants. Photo by Michael Ford Parks for The Washington Post