Original Justified actor Walton Goggins explains why his character, Boyd Crowder, isn't a part of Justified: City Primeval. In the role of Boyd, Goggins appeared in every season of the original Justified series. Though he was originally meant to die in the premiere episode, Boyd was kept around after executive producer Graham Yost and test audiences responded favorably to Goggins' performance. In the process, Boyd went from a guest character to one of the show's most memorable regulars.

https://screenrant.com/justified-city-primeval-show-boyd-not-returning-walton-goggins-explained/