MUSKOGEE, Oklahoma - Muskogee Police arrested a man wanted on suspicion of sexually abusing children in Tulsa County. Brian Paul Campbell was taken into custody Tuesday night after a tip.

Court records show Campbell is charged with two counts of sexually abusing children under the age of 12. A woman named Christina Renea Mathews was arrested with Campbell, booked on complaints of permitting abuse and abusing another child.

Police say they molested her 8-year-old relative, showed the children pornographic movies, took nude photographs of the kids and made them watch the adults have sex.

They say Campbell told them he has thoughts of killing people every day and he has a gun.

Muskogee Police said they were arrested near a Sonic on York.

Police said Campbell was dating women to get access to their children. They say he didn't care how old the kids were or if they were a boy or a girl, he sexually abused them all.

“This case is horrific,” said Child Crisis Detective Aubrie Thompson.

Four women in all are charged in the criminal investigation.

Three of the women are in Tulsa County Jail for permitting possible abuse. They are Beverly Ann Vaughan, Dawn Jane Cox and Crystal Lynn Toney.

Vaughan is being held for permitting child sexual abuse and child neglect, allowing children to live in a home with "extreme filth including horrible odor, cockroaches and nests of cockroaches, piles of clothing and/or piles of trash," court records show.

Police say Vaughn's kids had been taken away twice before when she failed to protect them from Campbell after he molested them before.

Cox was arrested on a charge permitting child sexual abuse, records show.

Police say after she found out about the abuse of her children, Cox told detectives she'd still allow Campbell around her kids and wanted to know how to pay for his defense.

Toney is also charged with letting Campbell have access to children and letting them live in a filthy home. She was taken into custody around 3:30 Wednesday afternoon.

Thompson said, "These mothers have not only failed to protect but have victimized their child over and over again."

Police say people had filed complaints of sexual abuse against Campbell going back to when he was a teenager, but, somehow the cases fell through the cracks.

"They say all the right things to the mom and try to come in like a knight in shining armor," Thompson said. "Really what he's doing, these suspects are often just courting the children they victimize."

Even though the detectives work hundreds of child abuse cases, they say this one will haunt them.