Koji will play an unnamed assassin at the heart of the unfolding mystery across the series.
Miller takes on the role of the formidable new Mayor of London set to wreak havoc for the gangs.
It has been a big hit for Sky, and AMC has been co-producing since Season 2.
L to R: Andrew Koji, Richard Dormer and T’Nia MillerJoseph Sinclaire
Adrian Sturges is EP for Sky Studios, while Noel Manzano EPs for AMC+.
Farren Blackburn and Tessa Hoffe also join the series as directors.
NBCUniversal Global Distribution handles international sales of the series on behalf of Sky Studios.
