SAN DIEGO (KGTV) - A former Camp Pendleton Marine was sentenced Monday to more than 17 years in prison for owning and distributing child pornography. William Walsh IV, 55, was arrested in May 2017. Escondido Police officers searched his home and seized hundreds of files Walsh had downloaded through peer-to-peer file sharing software. A jury found Walsh guilty of all charges. U.S. District Judge Anthony J. Battaglia said Walsh’s conduct was “on the extreme end of the cases I have seen.” “Today a man who committed terrible crimes against children was sentenced to many years in prison,” said U.S. Attorney Adam Braverman. “These horrible experiences will echo in the hearts and minds of young victims for a lifetime, and I am deeply distressed and deeply committed to pursuing cases that will protect our vulnerable youth from people like Walsh.” “Today’s sentence confirms that this predator can no longer victimize innocent children because he is off the streets and he is offline,” said FBI Special Agent in Charge John Brown. “This investigation showcases the success of collaborative federal and local investigations working toward a common goal.” Walsh will serve his sentence in federal prison.