PHOENIX (AP) - Authorities say a Phoenix man has been sentenced to 20 years in prison for sexual exploitation of a minor.
The Arizona Attorney General's Office says 45-year-old Michael Mattox also was sentenced to two consecutive terms of lifetime probation and will be required to register as a sex offender.
State prosecutors say Mattox posted images to an internet message board in October 2017 and posted messages that referenced that he had child pornography to trade.
Homeland Security Investigations obtained a search warrant for Mattox's home in April 2018.
They reported finding digital devices that had images and video of child pornography that were downloaded from the internet and images of child porn that were created by Mattox.
Investigators say Mattox had been downloading child pornography for years.