A Federal Way man was sentenced to 18 years in prison and lifetime supervised release for five federal felonies involving sexual exploitation of children Monday in U.S. District Court in Seattle.

Steven Marc Rigtrup, 38, pleaded guilty in November 2017 to enticement of a minor, two counts of distribution of child pornography, possession of child pornography and production of child pornography, according to a Department of Justice media release. He was arrested in April of 2017.

According to the Department of Justice release, law enforcement began investigating Rigtrup after receiving a tip from the National Center for Missing and Exploited Children that child sex abuse photos had been uploaded from an email account associated with Rigtrup. They searched his residence and devices in February of 2017 and found more than 588 images and four videos of children being raped and molested, according to the release.

Rigtrup had previously served a year in prison after he was arrested and prosecuted in King County Superior Court in November 2014 for soliciting sex over the internet from an undercover police officer posing as a teenager.

His latest arrest was investigated by U.S. Immigration and Customs Enforcement’s Homeland Security Investigations. The case was part of Project Safe Childhood, a nationwide initiative launched by the Department of Justice in 2006 to combat child sexual exploitation and abuse.