"I think he's a coward," Mr. Malvo said of his former mentor, just minutes after saying he had once loved Mr. Muhammad. Mr. Malvo, 21, who has agreed to plead guilty in the Maryland killings, said Mr. Muhammad, 45, pulled the trigger in all but three of the shootings. "You took me in your house, and you made me a monster," Mr. Malvo added, staring coldly at Mr. Muhammad.  Families of the victims watched as Mr. Muhammad was forced to confront the loss of loyalty of his former disciple.  "Son," Mr. Muhammad said at one point to Mr. Malvo while cross-examining him.  Angrily, Mr. Malvo interrupted: "I would prefer you address me by my name."  For Denise Johnson, the widow of Conrad Johnson, who was Mr. Muhammad's last victim, Mr. Malvo's testimony brought some consolation.  "It was a huge relief to see Malvo take the stand and say what he did," Ms. Johnson said after the trial. "And we didn't expect anything less from the verdict."  Scott E. Sundby, a law professor from Washington and Lee University who followed the case closely, said the verdict was also vindication for the jury in the Virginia trial that sentenced Mr. Malvo to life in prison rather than death.  "Mr. Malvo's testimony made it pretty clear that he was very much under Mr. Muhammad's sway at the time of these shootings," Mr. Sundby said.  Mr. Malvo described in riveting detail how Mr. Muhammad, whom many former acquaintances have described as a loving father driven over the edge by the loss of custody of his three children, planned a two-stage killing spree.  First, Mr. Muhammad and Mr. Malvo would randomly shoot and kill up to six people a day for a month, Mr. Malvo testified. Then they would bomb schools, school buses and children's hospitals, he said.  In the short term, Mr. Malvo said, their aim was to create havoc to cover for Mr. Muhammad's plans to kidnap his three children. The longer-term goal, Mr. Malvo testified, was to extort law enforcement to stop the killing, after which Mr. Muhammad would take the money and move to Canada with Mr. Malvo and the three children. There, Mr. Malvo said, Mr. Muhammad planned to create a training ground for 140 young homeless men whom he would send out to wreak similar havoc and to "shut things down" in cities across the United States.  For Mr. Muhammad, the trial was an exercise in control.  Referring gently to witnesses as "sir" and "ma'am," and frequently begging for the "court's indulgence," Mr. Muhammad showed a strong feel for courtroom etiquette as he painstakingly tried to snare witnesses in small factual inaccuracies and grilled detectives about mistakes in the collection of his DNA during the investigation.  But over the weeks, Mr. Muhammad seemed to grow tired as his original plans to call more than 100 witnesses were foiled; he missed deadlines to file paperwork, and many who were called refused to show up.  During testimony, the prosecution continually broke his momentum with a barrage of objections, most of them sustained by the judge.  "He was impressive until the fourth act of the play," Mr. Sundby said. "But his entire performance fell apart when it came time to weave together all his questioning into a single coherent argument."  Mr. Muhammad closed with a spirited description of the police and prosecution's elaborate efforts to frame him by fabricating the DNA evidence and planting the data found on his computer linking him to the shootings.  He became most agitated as he said Mr. Malvo had been indoctrinated by the prosecution. "I don't care what you saw," he said, referring to Mr. Malvo's testimony. "Lee is a magnificent human being, and I don't care what they've done to him. My son is innocent. I'm asking you to find us both not guilty."  The judge cut Mr. Muhammad off after nearly three and a half hours.  After a long weekend, the jury returned to begin, and quickly end, their deliberations. As the foreman read the verdict on each count, Mr. Muhammad sat still and glaring, his arms folded across chest. "Your honor, may I speak?" Mr. Muhammad asked after the verdict was read.  "No, sir," the judge replied as Mr. Muhammad was led away by guards.  A version of this article appears in print on , on Page A14 of the New York edition with the headline: Washington-Area Sniper Convicted of 6 More Killings. Order Reprints| Today's Paper|Subscribe
John A. Muhammad, who has already been sentenced to death in Virginia, now faces six life sentences in a Maryland case.