Veteran actor Stephen Greif, known for his role in the hit British sci-fi series Blake’s 7 and more recently Netflix’s The Crown, has died. He was 78.

His talent agency representatives confirmed the passing in a Twitter post, writing, “With great sadness we announce the death of our wonderful client Stephen Greif. His extensive career included numerous roles on screen and stage, including at the National Theatre, RSC and in the West End.