BLACKSBURG, Va. (AP) -- A 13-year-old girl who vanished from her bedroom was stabbed to death by a Virginia Tech student, and another freshman already charged with hiding the body was more deeply involved, authorities said Tuesday. A neighbor said the seventh-grader told friends she would sneak out to meet her "boyfriend" David, an 18-year-old she met online through the Kik messaging app.
Nicole Madison Lovell was killed Wednesday, the same day she vanished, by David Eisenhauer, a freshman at Virginia Tech now jailed on charges of kidnapping and murder, Commonwealth's Attorney Mary Pettitt said Tuesday.
The prosecutor also announced that Eisenhauer's classmate, Natalie Keepers, will face a more serious charge of being an accessory "before the fact" to first-degree murder, in addition to helping to dispose of the body. The new charge could mean a life sentence if convicted.
Eisenhauer said "I believe the truth will set me free" after he was arrested on Saturday, a police document says.
Nicole's mother discovered her missing last Wednesday morning, setting off an intense hunt for the girl, who suffered from bullying at school and online over her weight and a tracheotomy scar, and needed daily medication after surviving a liver transplant, lymphoma and a drug-resistant bacterial infection as a 5-year-old.
Police quickly zeroed in on Eisenhauer, and then found Nicole's body on Saturday, hidden off a North Carolina road, two hours south of campus.
Stacy Snider, a neighbor whose 8-year-old twins played with Nicole, told The Associated Press that before she vanished, Nicole showed her girls Eisenhauer's picture along with a thread of texts they had shared and said she would be sneaking out to meet him.
"She was talking about this boyfriend she had that was 18 and went to college, and his name was David. And showed some text messages off of a Kik and pictures. And that's what the girls told the police officers when they asked."
Snider said she learned all this from her girls only after Nicole vanished. "I would have told her mother. But we didn't know nothing about it until she came up missing, unfortunately," she said.
Her fate devastated her mother, Tammy Weeks, who also spoke at Tuesday's news conference, describing the health problems her daughter battled and the joys in her short life.
"Her favorite color was blue. Nicole was a very lovable person. Nicole touched many people throughout her short life," Weeks read from a statement before her sobs became uncontrollable and she was ushered away.
Blacksburg police said they have evidence showing Eisenhauer knew the girl before she disappeared Wednesday, but provided no more details.
"Eisenhauer used this relationship to his advantage to abduct the 13-year-old and then kill her. Keepers helped Eisenhauer dispose of Nicole's body," a police statement said.
Kik Interactive, based in Ontario, Canada, was "active in helping the FBI carry out their investigation," spokesman Rod McLeod said.
Also, at Kik's request, Apple stopped advertising Kik Messenger as appropriate for kids 9 and older on its iTunes store on Monday. "Yes, we did recently ask Apple to change our rating to 12+. This more closely matches the age (13) in our TOS (terms of service)," McLeod told the AP.
Kik, along with Instagram and Snapchat, are particularly popular with younger teens, and it's impossible to keep underage users from signing up. Even kids whose parents closely monitor their activity on sites such as Facebook often use smartphones with other social media where predators lurk, said Adam Lee, special agent in charge of the FBI in Richmond.
"Kids are crafty," Lee said. "They will have one account parents have access to, and half a dozen they shield from their parents' view."
David Finkelhor, director of the Crimes Against Children Research Center at the University of New Hampshire, agreed that parental oversight is a good thing, but cautioned against placing too much blame on technology.
"Although there has been an increase in crimes that have some social media-related nexus to them, the overall level of crime victimization -- including sexual assaults and kidnapping and even peer bullying -- has declined," Finkelhor said. "So it's a complicated picture."
Teens who are vulnerable online would be vulnerable in other situations as well, Finkelhor added, especially those who are "socially isolated or dealing with some emotional problem, not well supervised, suffering rejection by families or peers. They are looking for support, someone who can give them affirmation."
Associated Press writers Juliet Linderman in Maryland, and Larry O'Dell and Alanna Durkin Richer in Richmond, Virginia, contributed to this report.