A Casper man who maybe in the US illegally, is heading to prison after admitting to one sex crime with an under-aged victim and not challenging another.

Rene Bustillos-Carillo was sentenced to 18-to-20 years in prison, after he pleaded guilty to one count of second degree sexual abuse of a minor, and no contest to one count of thrid degree sexual abuse of a minor.

Investigators with the Casper Police Department say through interviews, the crimes took place between 2011 and 2013 with one victim, while the other happened between July 2014 and February 2015.

Carillo told police that his actions were first playful, but then later admitted that they eventually became inappropriate.

His actual sentence was 18-to-20 years in prison for the second degree sexual abuse of a minor charge, and 13-to-15 years for the third degree sexual abuse of  a minor charge.

Both sentences will run concurrent, or at the same time.