SALT LAKE CITY — The criminal case tied to a multimillion-dollar drug ring, that operated from a Cottonwood Heights basement and used the darknet to sell pills laced with a powerful and deadly opiate, drew to a close Friday as those who helped run the scheme were sentenced to prison. Aaron Shamo, the 31-year-old college dropout who authorities said raked in millions of dollars selling the fentanyl-laced painkillers on the darknet, was ordered in October to spend the rest of his life behind bars. The pills he pressed in his basement and sold with the help of eight others caused more than 90 deaths. They say the actual total isn't clear because investigators couldn't track down every distributor who purchased the pills in bulk and then sold them to others.