Arrow is losing an original cast member after Season 6. THR reports Paul Blackthorne won't reprise his role as detective Quentin Lance for Season 7. The character has been a part of the show since the pilot, and there's currently no word yet on why Blackthorne is leaving and how Quentin Lance will be written out. This will leave Stephen Amell (Oliver/Arrow) and David Ramsey (Diggle/Spartan) as the only two series regulars remaining from the first episode.