SPRINGFIELD, Mo. -

A teenager was in jail on Thursday after being charged with raping a 15-year-old girl.  Mathew White, 17, of Willard faces several charges. 

A probable cause statement says the girl claims White sexually assaulted her by breaking into her room and threatening her with a knife.  Police say the girl told investigators it happened almost every night for four months. 

The probable cause statement does not say what the relationship is between White and the victim.  The statement says he admitted to investigators that he attacked her.  

White's bond is set at $100,000.  If he's convicted, he could get a life (30-year) prison sentence.  Prosecutors hope he also would be under supervised probation after that until he is an old man.