Chippewa Falls police say a juvenile suspect has been arrested in the death of a 10-year-old girl. W-E-A-U / T-V reports Lily Peters went missing Sunday night and her body was discovered Monday morning. Chippewa Falls Police Chief Matthew Kelm says the suspect and victim knew each other. Kelm says his department got more than 200 tips and some of them were critical to the investigation. Nearly 20 federal, state, and local agencies worked on the case. The family was notified of the arrest before a news conference was held Tuesday afternoon.