Inappropriate relationship presumably with a player. Rumor has it she's pregnant. Couldn't keep his stinger out of the 'ole honey hole.
http://wtop.com/ncaa-basketball/2016/04/tyler-summitt-resigns-as-louisiana-tech-womens-coach/
http://wtop.com/ncaa-basketball/2016/04/tyler-summitt-resigns-as-louisiana-tech-womens-coach/