NORMAN — A man whose rape case helped spark a student-led walkout at Norman High School in 2014 was given an additional year of prison time Thursday for violating the terms of his sentence.

Tristen Killman-Hardin, 20, was convicted of rape in 2015 for assaulting a Norman High School student. Before he was sentenced that year, two other female students alleged Killman-Hardin sexually assaulted them.

The students called the school's response to the allegations inappropriate, leading to a protest in which hundreds of students walked out of class to join relatives and advocates for a day-long demonstration outside the school.

In November, Killman-Hardin was arrested for violating his sex offender status by being near Norman North High School. He was charged in Cleveland County District Court with one count of entering a safety zone around a school while being a registered sex offender. Killman-Hardin told police he was waiting for a friend when he was arrested.