A Manhattan man was sentenced Monday to nearly 11 years in prison after he was convicted in Riley County District Court of involuntary manslaughter, distribution of fentanyl, distribution of marijuana and possession of fentanyl. Luke Patrick Johnson, 22, was sentenced to a combined prison sentence of 10 years and 10 months for his convictions, which come from two separate court cases. He entered a plea deal with the state Aug. 18.