Yellowstone's newest spinoff Marshals mentioned some members of the Dutton family - but what happened to Wes Bentley's character Jamie? Jamie was originally introduced when the OG show premiered on Paramount Network in 2018. He was John Dutton's (Kevin Costner) adopted son, which led to a complex relationship between the pair. Jamie was ultimately responsible for his father's death earlier in the season - and that caused John's daughter Beth (Kelly Reilly) to want to seek revenge on her brother.