Savvy LI Killer Used Tech to Torment Victim's Sis

After the suspected Long Island serial killer took Melissa Barthelemy's life, he likely took her cell phone and used it to torment her teenage sister—and he did so in a way that leads cops to think that he's no stranger to their investigative methods, reports the New York Times. "He is a guy who is aware of how we utilize technology,” one investigator says. “Frankly, people are thinking maybe he could be a cop.”

The man called Amanda Barthelemy roughly half a dozen times over six weeks from crowded, untraceable places like Times Square, and kept his taunting calls to less than three minutes—thwarting cops' efforts to track him. The Barthelemy family won't say what he said, but, “If you accept it was the killer calling, he certainly had feelings of anger towards prostitutes," says the family lawyer. He also never revealed that the victim was dead: "He kept us hopeful," says mom Lynn Barthelemy. (More Long Island serial killer stories.)