The teenager accused of killing his sister agreed to a plea deal Tuesday.
Frederick Lochridge was 15 when he was charged with second degree murder with a firearm in the death of 10-year-old Izabella Heffernan. Izabella was found dead in a field behind her Fountain area home in February of last year.
Lochridge, 16, ultimately confessed to the killing and gave investigators three varied accounts for how the shooting happened.
Lochridge will now serve 50 years in prison with 10 years of probation.