Scoot McNairy joins True Detective season 3 cast Deadline reports that the True Detective season 3 cast has gained another notable addition with Scott McNairy (Fargo, Killing Them Softly) joining the series. McNairy will play a character named Tom, whom the outlet says “suffers a terrible loss that ties his fate to that of two state police detectives over 10 year.” He joins a cast that includes Academy Award winner Mahershala Ali (Moonlight), Carmen Ejogo (Selma), and Stephen Dorff (Blade, Somewhere, Leatherface). True Detective Season 3 will tell the story of a macabre crime in the heart of the Ozarks and a mystery that deepens over decades and plays out in three separate time periods. Ejogo will play the female lead, Amelia Reardon, an Arkansas school teacher with a connection to two missing children in 1980.