(CNN) There is still so much we don't know about how a 13-year-old Blacksburg, Virginia, girl got to know an 18-year-old Virginia Tech freshman before he allegedly stabbed her to death. What we do know is a bit more about a possible motive in the death of Nicole Lovell, a middle school student. David Eisenhauer, a college track and field athlete, is thought to have had an inappropriate relationship with Lovell and stabbed her to death because she threatened to expose their relationship, according to a law enforcement official. But how did they meet? How did the alleged relationship begin?Nicole Lovell, 13, may have met her alleged killer onlineBest Internet safety tip for parents: Be involved with their children's digital lives, experts say
But I keep thinking about the smart advice from these _ safety experts: We can take steps to try to keep our kids safe.