Nineteen-year-old Samantha Spiegel, who appeared Wednesday on NBC's "Today" Show, said Karr is trying to recruit girls 6 and younger, and preferably brunette, for a sex cult she called "The Immaculates," says CBS affiliate KPIX.
In a further twist, Spiegel also claimed John Mark Karr is now living as a woman.
Spiegel was granted a temporary restraining order against Karr April 19, but the courts have been unable to serve him with the papers because they can't find him.
Spiegel says she was nine when she first met Karr, who was a teacher's aide at her all-girls Catholic school. She lost touch with him, but attempted to reconnect after Karr confessed to the 1996 murder of JonBenet Ramsey, says Spiegel's attorney Robin Sax.
Sax is a Crimesider contributor.
Karr's bizarre, detailed confession in the Ramsey case was dismissed because DNA tests failed to connect him to the crime scene.
Unfortunately for Spiegel, she says she opened up a door for Karr that she could not close. According to Sax, Karr began emailing and instant messaging Spiegel over a hundred times a day.
The teen maintains that Karr, who now goes by the woman's name Alexis Valoran Reich, made what was described as "ongoing death threats" and "threats of exploitation to children" in emails.
Spiegel, who claims Karr brainwashed her, says she and Karr had been engaged, and that he told her to help him recruit children. She even thought about letting him meet her niece, says KPIX.
She says she's speaking out now to help other potential victims.
"I think I was just thinking that he was misunderstood. He was a victim of his childhood, of his family, of everybody, and that he needed to be saved in some sort of way," Spiegel said.
As for Karr's apparent name change, it was reported by media outlets as early as March that Karr was undergoing a full gender transformation, reports KPIX.