Cedar Rapids, Ia (AP) — A man has been sentenced to 20 years in federal prison for selling a fatal opioid cocktail. The U.S. attorney’s office said in a news release that 30-year-old Carl Ravon Watkins, of Dubuque, was sentenced Wednesday for one count of distribution of controlled substances resulting in death. He pleaded guilty to the crime in June. In a plea agreement, Watkins admitted to selling a woman what was supposedly heroin in August 2019. An autopsy found fentanyl and an analogue of fentanyl called acetyl fentanyl in her system.