Who is Gilly O'Shaughnessy from Wild Justice and what is their importance?

Gerald O'Shaughnessy (Gilly) has straight black hair and eyes like a falcon. He is lean, lithe, and in excellent physical condition. Born in Belfast in 1946, Gilly has a long and varied criminal record. He lives for the thrill of the hunt, and he enjoys the cat and mouse situations that his 'profession' place him in. Ruthless, he believes himself to be a true revolutionary.