SIOUX FALLS, S.D. (KOTA-TV) — A former Chicago White Sox minor leaguer who went on to coach a South Dakota youth team after his playing career ended has pleaded not guilty to sexually assaulting a child and possession of child pornography. KOTA-TV reports Juan Thomas Jr., who entered the plea Monday, is being held on a $250,000 cash bond. The 48-year-old Thomas is charged in Lincoln County with raping a child younger than 13 and 10 counts of child porn possession. He was a first-baseman and right fielder who played two seasons for the Seattle Mariners’ Triple-A affiliate and later played for the Sioux Falls Canaries in the American Association of Independent Professional Baseball.