Series author Mercurio stated: “We couldn’t be more thrilled that Robert Carlyle will star in series seven as specialist rifle officer Shaun Massie.
“I’ve been an enormous fan of Robert’s work for a few years and it will likely be a profession spotlight to work with him.
“Robert always brings mesmerising power and depth to every role. I know viewers will be on the edge of their seats wondering what his character will do next, and why.”
Lindsay Salt, director of BBC Drama, added: “Sometimes a piece of casting feels so right that you just can’t imagine anyone else.
“Robert Carlyle is one of our best actors and the right match for the phenomenon that’s Line Of Duty.”
Line of Duty launched in 2012 and went on to become one of the most popular TV drams of the last decade.
Its seventh collection will air on BBC One and BBC iPlayer subsequent 12 months.
