Simmer down Tommy Merlyn (Colin O'donnell) conspiracy theorist. The character in question is Diggle's (David Ramsey) brother, Andy (played by Eugene Byrd). Diggle recently learned from Det. Lance (Paul Blackthorne) that his brother was not the stand up guy he thought he was and that's something he'll struggle to come to terms with as the season progresses.
Speaking to EW,Arrow showrunner Wendie Mericle stated, "Diggle’s really dealing with the grief and sense of loss. He’s grieving two losses, really — the idea of who his brother was and confirmation of why his brother was murdered. The truth is, he knows that his brother was involved in this bad, shady stuff, but he doesn’t know how or when or why. He doesn’t know Andy’s point of view. He’s never heard Andy’s side of the story.We’ll definitely be seeing Andy coming up in future episodes and we’ll get some pretty shocking answers about what happened to him."
Arrow is all new, tonight at 8/7c on The CW.