 Investigation into the sale of fentanyl in Beloit began last year by the Rock County Sheriff's Office and the United States Drug Enforcement Administration. As a result of the investigation, two individuals were indicted federally by the Western District of Wisconsin. Earlier this month, 39-year-old Darnell Isabella Beloit was sentenced to seven and a half years in prison and 38-year-old Jarrell Knight of Hammond, Indiana was sentenced to eight and a half years.