OAKLAND, Calif. -- Jurors deliberating the mysterious case of a woman who vanished after taking her children to her estranged husband's house have come back with an answer: He did it.

Hans Reiser, 44, bowed his head Monday after the jury convicted him of first degree murder in the death of Nina Reiser. The conviction carries a sentence of 25 years to life in prison.

Nina Reiser disappeared more than a year ago after dropping the couple's children off at Hans Reiser's home. Her body has never been found.

Reiser, known in programming circles as creator of the ReiserFS computer file system, testified for several days in the six month trial, often giving rambling answers and getting scolded by the judge for arguing with the prosecutor.

Defense attorney William Du Bois said Monday he was disappointed with the verdict, but didn't think things would have gone differently if Reiser had never taken the stand.

Tom Orloff, the district attorney for Alameda County, said the verdict "does justice for Nina Reiser and her family."

Du Bois argued during the trial that there was no direct evidence linking his client to Nina Reiser's disappearance and suggested the woman may be living in Europe or may be the victim of foul play.

But prosecutors argued the circumstantial evidence against Reiser was strong: the two were involved in a bitter custody dispute, traces of her blood were found in his home and car and witnesses testified she would never have left her children.

Also, prosecutor Paul Hora said that after Nina Reiser disappeared, Reiser threw away the passenger seat of his car, hosed down the floorboards and started withdrawing large amounts of cash.

Alameda County Superior Court Judge Larry Goodman, who clashed with Reiser throughout his trial, then ordered that bailiffs immediately remove Reiser from the courtroom.

Reiser's attorney, William DuBois, said he didn't know why the judge had Reiser removed even though he hadn't acted up. DuBois said that in his 38 years of practicing law he's never seen a judge remove a defendant immediately after a verdict.

As a bailiff grabbed his arm, Reiser said, "I've been the best father that I know how."

On his way to the stairway outside the courtroom, Reiser asked, "Can I speak to my attorney?"

He was led away, but he'll return to court on Tuesday to have his sentencing date set. When Reiser was arrested in October 2006, he was carrying his passport and thousands of dollars.

Du Bois portrayed Reiser as eccentric, but nonviolent, and said there were innocent explanations for his behavior.

Reiser testified his wife left his house alive and he had nothing to do with her disappearance. He said he threw away the car seat to make the car more comfortable for sleeping in and washed the car floor because it was dirty.

Reiser said he drew out the cash to pay programmers at his company and was in the habit of carrying his passport as a frequent traveler.

The prosecution presented Nina Reiser as someone who would never have abandoned her children.

Hora also said Reiser hated his estranged wife, and saw her as "the destroyer."

"She destroyed his marriage. She had an affair. He -- although it was never proved -- thinks she embezzled hundreds of thousands of dollars from him," Hora said during the trial.

Hora showed jurors a video of Nina Reiser at her son's 6th birthday party, ending with a freeze-frame of the mother kissing her son's cheek.

He also played jurors a tape of an interview with Rory outside of court in which the prosecutor asked the boy if he knew where his mother was.

Rory said he didn't, and that made him feel sad.

"What did you like best about her?" Hora asked.

"Everything," said the boy.