Fahey will play a weathered, shaky man on FX drama
Fahey will play Zachariah Randolph on the series, which enters its sixth and final season in January.
In his 60s, Randolph is described as weathered and a little shaky, a man beaten down by hardship and drink. An Old Coot from the hill country, Zachariah can still find his way around an abandoned mine shaft.
The series has also cast Sam Elliott and Garret Dillahunt for its final season.