ST. LOUIS (AP) — An Ohio man could face up to life in prison after being convicted of transporting four teenage girls to Missouri to engage in prostitution.

A four-day trial in U.S. District Court in St. Louis ended Thursday when 54-year-old Kyle Maurice Parks of Columbus, Ohio, was convicted of several counts related to sex trafficking. Sentencing is April 19.

Prosecutors say Parks and two women brought three 17-year-old girls and a 15-year-old runaway to the St. Louis area in December 2015 and advertised sexual services on Backpage.com.

Columbus police searching for the runaway tracked her phone and found the victims in a St. Charles, Missouri, motel.

Parks’ attorney said during the trial that his client was running a legal adult entertainment business but had been misled about the ages of the girls.