Judge Gayle Crane sentenced Alvin Eugene Brown, 36, Big Cabin, Oklahoma, to 17 1/2 year in prison.
As part of a plea agreement with the Jasper County Prosecuting Attorney's office, a second statutory rape charge against Brown was dropped and he waived his right to have a pre-sentence investigation.
Brown's trial had been scheduled to begin Monday.
The guilty plea was the second this week in the case
On Monday, Brown's accomplice, Amber Ramirez, 37, Sarcoxie, who brought the 13-year-old victim to Brown, who is her boyfriend, had sex with Brown twice in front of the child, smoked meth with Brown and handed the sex offender a condom before one of the rapes, pleaded guilty to felony endangering the welfare of a child.
As part of a plea bargain agreement with the Jasper County Prosecuting Attorney's office, a statutory rape charge against Ramirez was dismissed.
Brown was convicted in 2010 in Oklahoma of lewd or indecent acts with a child.
In her plea hearing, Ramirez acknowledged she was aware Brown was a sex offender when she took the 13-year-old and three other underage girls who had been at a birthday party to Oklahoma to pick up Brown and bring him back to Missouri.
The rapes of the 13-year-old took place the following day, March 2, in a room at the Budget Inn in Carthage.
Brown had sexual intercourse with the girl and forced her to perform a sexual act on him, according to the probable cause statement.
Ramirez' sentencing is scheduled for 9 a.m. September 16.
Sarcoxie woman did meth, handed a sex offender a condom, watched him rape 13-year-old - and she got a plea bargain