30 years after the murders , Jebson confessed to the crimes .
30 years after the murders , Jebson was already serving a life sentence for the 1974 murder of 8 - year - old Rosemary Papper .
30 years after the murders , Jebson confessed to the crimes and was already serving a life sentence for the 1974 murder of 8 - year - old Rosemary Papper .