http://www.cbsnews.com/8301-504083_162-20008573-504083.html?tag=latest YORKVILLE, N.Y. (CBS/WTVH) Police charged a Whitesboro, N.Y. teenager with second-degree murder Monday after the 2-year-old girl he was babysitting on Friday was found dead,. The 13-year-old boy pleaded not guilty in Floyd Town Court where he was held without bail awaiting a hearing on Friday, said State Police Capt. Mark Lincoln during a news conference. According to WTVH, the boy is accused of hitting "family friend" Melissa Calhoun in the face with his hand, causing her to hit her head on the floor and a table. Investigators believe he then slammed Melissa's head into a refrigerator door and proceeded to sexually assault her.