Story Highlights• Neighbors: Arthur Mann seemed fine days before he allegedly killed Clara Riddles
• Mann formally charged with murder, aggravated battery in CNN Center shooting
• Suspect had third-degree murder and sex with a minor convictions in Florida
• Mann all but lived at the house of Riddles' parents in Atlanta suburb
By Ann O'Neill and Ashley Fantz
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ATLANTA, Georgia (CNN) -- CiCi and Toon -- those are the nicknames kids in the neighborhood knew doting couple Clara Lee Riddles and Arthur Lawrence Mann.
Together for two years, they seemed in love. Mann, 39, hung out and talked basketball with neighborhood boys. Riddles, 22, was a big-sister type, always doling out advice. But two weeks ago, the couple broke up.
"That was his girl, man. That was his everything," said 18-year-old neighbor Joseph Brown.
Mann didn't seem angry. "I was talking to Toon three days ago. Everything was fine."
But all was not fine. Police say Mann walked into the CNN Center in downtown Atlanta and fatally shot Riddles on Tuesday, causing a flood of visitors in the CNN complex to scatter. (Interactive: Track the shooting)
A witness described seeing Mann drag Riddles by her hair down an escalator from the lobby of the Omni Hotel, where she worked.
At the bottom of the escalator, just feet from an entrance to CNN.com, Mann shot Riddles three times -- in her shoulder, torso and, at close range, in the head, police and a Fulton County medical examiner investigator said.
A Turner Broadcasting security officer shot him. (Watch security officers aim weapons at suspect after shooting )
Riddles and Mann were rushed to Grady Memorial Hospital, where she died and he is now in stable condition following surgery.
Atlanta police spokesman Officer James Polite said Mann is being held in a detention unit of the hospital and has been formally charged with murder and aggravated battery.
A troubled past
Neighbors said they didn't see the violence coming.
"That's not Toon," Brown said. "That's not him, from what I've seen."
Mann didn't talk about his past -- the eight years he spent in prison in Florida where he is a registered sex offender.
Court records in Florida tell this story: In July 1992, he was convicted of third-degree murder and two counts of robbery with a gun and was sentenced to 10 years, according to Robby Cunningham, a Florida Department of Corrections spokesman.
Mann served five years of that sentence, violated his probation at least twice, was put back in prison and when he got out was charged and convicted in March 1999 of having sex with a minor 16 to 17 years old. For that conviction, he was sentenced and served three years, Cunningham confirmed.
After his probation ended in March 2004, Mann later moved to Georgia, and in October 2006, he was convicted of failing to register as a sex offender in the state.
Records show he registered eight days later, but Georgia did not verify that registration until about two weeks ago, on March 22 of this year, which is about the same time neighbors say he and Riddles broke up.
Close to family
Mann and Riddles' family were very close, neighbors said.
Mann all but lived at her parents' house in Fairburn, a suburb about 25 miles southwest of Atlanta. About three months ago his mother died in Florida, and he returned there, neighbors said. When he came back, the couple split up.
Riddles often talked about getting her own apartment in the city, neighbors said.
But Louise Raggett, who recently moved in across the street from the Riddleses, said they are hard-working, quiet, "good people."
Riddles' father, Jimmie, is retired and "watches out over everybody" in the neighborhood. Her mother works.
On Tuesday, Jimmie Riddles knocked on Raggett's door early in the afternoon.
"Louise, that boy shot my daughter," Raggett recalled him saying.
Riddles' father was crying. He turned, in silence and walked back home, Raggett said.
Arthur Mann, 39, the suspect in this week's fatal CNN Center shooting, is a registered sex offender in Florida.
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