When Colin Donnell joined the cast of Arrow as Tommy Merlyn,it was widely believed that Tommy would turn out to be Oliver Queen's greatest foe and rival archer, Merlyn. Instead, or that role went to Donnell's on-screen father,John Barrowman, while Tommy met his demise in the Season 1 finale. But even though Donnell was written out of Arrow, or he hasn't stayed too far absent from the reveal he once called home.
Source: blastr.com