Warning: This article contains graphic details that may disturb some readers.
A source has revealed what US murderer Chris Watts' life is really like in prison, exposing how fellow prisoners and guards want nothing to do with him.
Watts pleaded guilty to murdering his pregnant wife and two daughters, aged just three and four, in November 2018. He is currently serving three consecutive and two concurrent life sentences at Dodge Correctional Institution in Wisconsin.
He turned 36 in prison on Sunday, and a source close to him told PEOPLE he spent his birthday like any other - alone.
"No one wants anything to do with him - he's on the lowest social tier of the entire prison," they said.
"He's in protective custody because if he's around other inmates, he'd be in real danger. He's an outcast, even among criminals."
According to the source, Watts will go days without speaking to anyone.
"He's probably the most hated man in that prison because he killed children... There's a definite pecking order in jail, and someone who hurts or kills kids is at the very bottom."
In a statement released to TV show Dr Phil in 2019, Watts explained he killed his wife by strangulation after admitting to her he was having an affair, to which she responded: "You're never going to see your kids again."
As he was wrapping her body in a sheet their four-year-old daughter Bella walked in and asked what he was "doing with mommy".
Watts told his daughters their mother was sick and they needed to take her to hospital.
Loading the wrapped body in his truck, Watts took his daughters with him to the remote oil-and-gas field where he worked. Once there, and after dumping the body of his wife in the dirt, he smothered three-year-old Celeste with her favourite blanket as Bella watched.
Watts then removed Celeste from the truck. When he returned for Bella, she had unbuckled herself from her seat and begged for her life while he struggled to kill her.
"Please daddy, do not do to me what you just did to Cee-Cee," Bella allegedly said.
He dumped his daughters' bodies in crude oil tanks at his workplace.
Prior to confessing, Watts attempted to frame his wife for murder-suicide.
Authorities say the murder was motivated by the affair he was having with a co-worker who believed he was already separated.
In December, the source told PEOPLE Watts spends his time in prison writing to pen pals - consisting mostly of women who contacted him after his sentencing.
"He'll write to his pen pals this season and they're sending him notes, as well... It's literally all he can do at this point."