DENVER (CBS4) – A registered sex offender has been sentenced to the maximum in connection with the kidnapping and attempted sexual assault of a 10-year-old neighbor boy last summer.

Lynn Kimbrough with the Denver District Attorney’s Office said Richard Holman, 51, pleaded guilty to second degree kidnapping and attempted sexual assault on a child.

Holman was sentenced on Friday to 48 years in prison plus 10 years of intensive supervised probation for sex offenders. He was also determined to be a sexually violent predator.

Holman has an extensive criminal history that includes sexual assault on children.