John Mark Karr: A Portrait of Obsession

A bizarre portrait is emerging of John Mark Karr, the 41-year-old man who has confessed to killing JonBenet Ramsey.

He spoke freely with the media during his arrest, saying, "I am so very sorry for what happened to JonBenet."

"I was with JonBenet when she died," Karr said to the media. "Her death was an accident."

When asked whether he was innocent of the murder, he said firmly, "No."

For the last four years, Karr e-mailed University of Colorado journalism professor Michael Tracey about the JonBenet case.

Tracey alerted authorities to Karr's activities.

According to family members, Karr was obsessed with the 6-year-old beauty queen from the time of her death in 1996.

Five years ago, he reportedly wrote term papers about JonBenet's unsolved murder and later began researching a book on young murder victims.

He tried to contact JonBenet's parents for an interview but was turned down. He spoke with her grandparents.

Karr appeared to be drawn to young people.

According to The Associated Press, at age 19, Karr married a 13-year-old after instructing her to lie about her age.

According to court documents obtained by ABC News, Karr married a second woman when she was just 16. They had three children.

In 2001, an arrest warrant was issued in his name on suspicion of possessing child pornography.

His wife took out a restraining order against him and prevented him from seeing his children.

Karr left the country and pursued what seemed to be a career fascination with children.

A resume with a photo that strongly resembles Karr is posted on the site The resume says that he hopscotched the globe working as a teacher for young children.

He was a private English teacher and caregiver in Germany and the Netherlands.

He also worked at a school in Honduras and taught English to corporate executives in Costa Rica.

Karr eventually landed at the Bangkok Christian College in Thailand.

"A lot of the teachers described him -- plain and simple -- as weird," said Karr's colleague Bryce Smith. "Kind of off. Kind of a stranger."

His resume also describes work as a nanny -- bathing, feeding, and tutoring his charges.

"I made sure the children had their evening bath, then put them to bed and read to them before they went to sleep," his resume says.

In Thailand, Karr was fired from one job for being "too strict."

He was starting in a new position as a teacher for young children just before his arrest.

ABC News' Heather Naurert and Chris Cuomo contributed to this report.

Material from the Associated Press was used in this report.