An Omaha couple have been sent to prison after pleading guilty to a sex-trafficking conspiracy.

A news release from U.S. Attorney for the Southern District of Iowa says 32-year-old Merrideth Crane-Horton was given 17 1/2 years Monday. Her husband, 35-year-old Edwin "Nate" Horton, was given more than 14 1/2 years.

Prosecutors say the couple and Katherine Heredia and Ramon Heredia pleaded guilty last year to a charge stemming from sex trafficking in Omaha and across the Missouri River in Council Bluffs. The Heredias are awaiting their sentences.

Investigators say the four ran the ring from August 2007 to June 2010. Prostitutes included a teenage girl.