OMAHA, Neb. (AP) – An Iowa man has been sentenced to eight years in prison after pleading guilty in a prostitution case in Nebraska. The U.S. attorney’s office in Omaha says 45-year-old Richard Costanzo, of Carter Lake, was sentenced last week after pleaded guilty to several crimes that happened between 1997 and 2009. They stemmed from the operation of an escort service in Omaha. Costanzo also was sentenced to eight years in prison after pleading guilty to witness tampering in a related case. That sentence is to run at the same time as his sentence for the prostitution and other convictions.