The Kansas Court of Appeals has ordered a new trial for a former high school debate coach convicted of sexually molesting a South Korean exchange student who was living in the man’s home.

Seventy-year-old Richard Young, of Buhler, was sentenced to more than 13 years in prison after being convicted in 2008 in Reno County District Court. Prosecutors said he fondled the 15-year-old student within days of the boy’s arrival to attend Buhler High School.

KWCH-TV reports the Kansas Court of Appeals reversed the conviction Friday, saying the trial judge improperly allowed evidence that Young had sexually abused his stepsons more than 30 years earlier.

District Attorney Keith Schroeder told KWCH he’ll appeal Friday’s ruling to the Kansas Supreme Court.