University spokesman Remi Barron says 47-year-old Grant Smith stepped down last month, several weeks after he was arrested Nov. 26 following a flight from Salt Lake City to Boston.
He had been placed on paid administrative leave upon his arrest, but Barron tells the Deseret News (http://bit.ly/xmWxcT ) Smith left before the school started any internal disciplinary action against him.
Prosecutors say a fellow first-class passenger saw Smith viewing the images and took a cellphone photo before alerting a flight attendant.
Smith was a materials science and engineering professor at the university. He has pleaded not guilty to child pornography possession.
