(KRON) — The aunt of murdered kidnap victim Xiana Fairchild has teamed up with a former local crime reporter to write about their jailhouse interactions with Xiana’s killer.

On Tuesday, KRON’s Maureen Kelly spoke to the authors about their chilling encounters, which they said still haunt them to this day.

“He tortured me,” Xiana’s aunt Stephanie Kahalehulu said.

For two months back in 2000, Kahalehulu forced herself to come face to face with her niece’s killer once a week. Curtis Dean Anderson was already behind bars at the time, arrested for the kidnapping of another Vallejo girl who had been able to escape.

That made him the prime suspect in the kidnapping of Stephanie’s niece, 7-year-old Xiana Fairchild, who disappeared the year before.

“He actually through the media said well, ‘If you want to know whether or not I took her, come in and talk to me,'” Kahalehulu said. “He said that she was still alive and that he passed her on to someone else, and that he still had control from the jail.”

Stephanie had raised Xiana as her own child and would do anything to get her back. And Anderson played on that, she said, taunting her through letters and visits, demanding that she put money in his jail account and even dress a certain way on her visits.

“And if I didn’t, then he would say, ‘Well, guess who gets hurt,'” Kahalehulu said.

At the same time, former crime reporter Kristi Belcamino was also getting letters from Anderson and visiting him to try and find out where Xiana was and if there were other victims out there. Kristi is now a mother living in Minnesota.

“I always felt really dirty after I got done talking to him,” Belcamino said. “I didn’t realize until I became a mother just how strongly that had affected my psyche.”

Xiana’s remains were eventually found in 2001. Anderson was sentenced to more than 300 years in prison, where he died in 2007.

Before his death, he confessed to killing 10 other people, including 7-year-old Pinole kidnap victim Amber Swartz Garcia.

Both Stephanie and Kristi said those visits 16 years ago affects them to this day.

Stephanie said she is still overly protective and worries about her two other children, even now that they are adults.

Both authors are both hoping that writing about their experiences will help them heal.

“It’s in the book, I can close the book,” Kahalehulu said. “And hopefully, that holds and moving forward things will get better.”

“Letters from a Serial Killer” comes out next week.