Originally, DTF St. Louis was meant to pull inspiration from the "My Dentist's Murder Trial" article - but how much of the show is actually based on a true story? In the new HBO show, which premiered in March, David Harbour plays Floyd, who is involved in a complicated love triangle with wife Carol (Linda Cardellini) and coworker Clark (Jason Bateman). Before the series debuted on HBO, it was announced that it would mirror an actual murder trial with Harbour, 51, and Pedro Pascal attached to star and executive produce.