involving his former assistant coach, and abc's ryan smith has all the latest. >> reporter: he's one of the winningest coaches in college football. >> and the ohio state buckeyes are the first national champions of the playoff era. >> reporter: bringing national championships to florida and ohio state. >> urban meyer will win his third. >> reporter: but this morning, ohio state head coach urban meyer placed on paid administrative leave after the football powerhouse announced it's investigating claims he may have known of a domestic violence allegation against his former assistant coach zach smith in 2015, long before smith was terminated last month. courtney smith claims her ex-husband zach abused her on multiple occasions. >> it was out of control to the point that he picked me up by my neck and threw me down on the ground in our bathroom and screamed at me, look what you turned me into. >> reporter: smith claims she told meyer's wife shelley about the abuse suffered in 2015...