Federal officials, speaking on condition of anonymity, identified the suspect as John Mark Karr, a 42-year-old American, and one law enforcement official told The Associated Press that Boulder police had tracked him down online.
The Ramsey family's attorney in Atlanta pronounced the arrest vindication for JonBenet's parents, John and Patsy Ramsey. Patsy Ramsey died of ovarian cancer on June 24.
"John and Patsy lived their lives knowing they were innocent, trying to raise a son despite the furor around them," Lin Wood said. "The story of this family is a story of courage, and story of an American injustice and tragedy that ultimately people will have to look back on and hopefully learn from."
The attorney said the Ramseys learned about the suspect a least a month before Patsy Ramsey's death. "It's been a very long 10 years, and I'm just sorry Patsy isn't here for me to hug her neck," Wood said.
Karr was a teacher who once lived in Conyers, Ga., according to Wood. The attorney said the Ramseys gave police information about Karr before he was identified as a suspect.
Wood would not say how the Ramseys knew Karr. But JonBenet was born in Atlanta in 1990, and the Ramseys lived in the Atlanta suburb of Dunwoody for several years before moving to Colorado in 1991.
A source close to the investigation said Karr confessed to elements of the crime. Also, a law enforcement source, speaking on condition of anonymity, told the AP that Karr had been communicating periodically with somebody in Boulder who had been following the case and cooperating with law enforcement officials.
District Attorney Mary Lacy said the arrest followed several months of work, but she said no details would be released until Thursday.
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Lawrence Schiller, author of the 1999 book "Perfect Murder, Perfect Town" about the case, said Wednesday he understood the man had been on a list of sexual offenders who were suspects for a long time.
"There are a lot of facts about her actual death that the public does not know." Schiller said. "If he did confess to some facts of the murder, to reveal those facts of the case, that would finish the puzzle."
Among the facts he said were not generally known was the murder weapon and what the killer did with it.