Idris Elba mourns The Wire co-star Michael K Williams after his death at 54

Idris Elba (Ian West/PA)

Idris Elba has joined the stars of The Wire in mourning the death of Michael K Williams at the age of 54.

The British actor, who played business-savvy Stringer Bell in the acclaimed drama series, simply posted a black square on Instagram, captioned “MKW.”