The mistress who Chris Watts killed his family to be with is still in touch with the killer, according to an inmate.
Watts is currently serving a life sentence without the chance of parole after he admitted to the brutal 2018 murders of his 15-week pregnant wife Shanann, 34, and their two daughters Bella, four, and Celeste, three.
In 2020, his story became the subject of Netflix documentary American Murder: The Family Next Door
Watts, 35, was having an affair with Nichol Kessinger, and although there was never any suspicion that she knew he would kill his family, she left Colorado and took on a new identity after the murders came to light.
Now, a Dodge Correctional Institution inmate has claimed she has written to Watts in prison.
Speaking to The Daily Mail, David Carter said: "He told me she said that she needed to speak to him to clear some things up.
"He wouldn't tell me exactly what she had said."
Carter, who was released from Dodge on 27 February, said it was back in September that Watts told him Kessinger was writing to him.
However, prison authorities subsequently found out and suspended his email account, according to Carter.
He said: "[Watts] wasn't supposed to have any contact with her, but she initiated it by writing to him."
Wisconsin Department of Corrections spokesman John Beard told The Mail he couldn't comment on Carter's claims.
Watts has been communicating with numerous women he's never met during his time in prison, having received an influx of letters after American Murder: The Family Next Door was released in September.
A source told People: "He got a lot of letters at first. Many of them are from women who thought he was handsome and felt compassion for him.
"He had nothing better to do, so he wrote them back. And he started having pen pals.
"A couple of them stood out, and they've kept in contact."
They added: "Some of the letters are angry. A lot of them are from people of faith who want to pray for him.
"But then he gets letters from women who want to connect with him, you know, romantically.
"He responds because he doesn't have anything better to do."