TURLEY, Oklahoma - The U.S. Attorney's Office for the Northern District of Oklahoma says former Turley pastor Ronald Robinson has been sentenced to 57 months imprisonment on a federal child pornography charge.

The 62-year-old man was also sentenced to 10 years supervised release after incarceration.

In a petition filed with the court, Robinson admitted to knowingly accessing "visual depiction of minors engaging in sexually explicit conduct." 

The petition goes on to say after reviewing with the government's written plea offer, Robinson decided to plead guilty and waive his right to a jury trial. 

A news release states some of the children were under age 12.

The investigation revealed that Robinson had engaged in conversations with other people in a chat room about raping, torturing and abusing children, according the release from Acting U.S. Attorney Loretta F. Radford.

The case was investigated by Homeland Security, the Tulsa County Sheriff's Office and Tulsa Police, records show. Assistant U.S. Attorney Neal C. Hong prosecuted the case.