CAMBRIDGE, Mass. -- Already defrocked by the church, former priest John Geoghan was found guilty by a jury of sexual assault Friday against a 10-year-old boy a decade ago.

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NewsCenter 5's Jack Harper reports that after nine hours of deliberations and three sets of questions for the judge, the jury came back with the verdict Friday afternoon. Geoghan had smiled and chatted while waiting for the jury, but his attorney said that his demeanor changed after the verdict was read.

"I would have to characterize it essentially as shock," defense attorney Geoffrey Packard said. "He was clearly stunned, I think."

Geoghan, 66, still faces two other criminal cases and 84 civil lawsuits accusing him of sexual abuse of children.

"I am very happy to see that Father Geoghan after all these years is going to serve time," mother of another alleged victim Maryetta Dussourd said.

An unnamed 20-year-old college junior testified that Geoghan had grabbed his buttocks when he was swimming at the Waltham Boys and Girls Club in 1991. Other alleged victims said after the verdict was read that they were happy Geoghan was convicted.

"It felt like a real long time. But I'm really, really happy," alleged victim Mark Keane said. "I can't put it into words -- overjoyed."

A clergy friend and Geoghan's sister were there until the end.

"Her reaction is basically this, that she is devastated," Packard said. "That she thinks that her brother is the best brother in the world and that she loves him."

The prosecution had admitted that this case was not the strongest one against Geoghan, but District Attorney Martha Coakley said that the trial was necessary.

"Although the allegations in this case to some may have seemed slight, those of us who work with children and particularly with child victims know that even one incident of unwanted sexual contact or conduct can be harmful to that victim," Coakley said.

Next Wednesday, the judge and the attorneys will get together to talk about when the formal sentencing will take place. In the meantime, Geoghan's bail was revoked, and he is being held in Middlesex County Jail.

Geoghan also faces two other criminal sexual abuse cases, the first of which is scheduled to go to trial Feb. 20 in Suffolk Superior Court.

Since 1995, more than 130 people have claimed Geoghan fondled or raped them during the three decades he served in Boston-area parishes.