In 'The Shield', which actor played corrupt detective Vic Mackey?

In 'Grey's Anatomy', what is Meredith Grey's surgical specialty? In 'Grey's Anatomy', what nickname is given to Dr. Derek Shepherd? In 'ER', which actor played Dr. Doug Ross? In 'NYPD Blue', which actor played Detective Andy Sipowicz? In 'Justified', which actor played U.S. Marshal Raylan Givens? In 'Deadwood', in which territory is the series set? In 'Lonesome Dove', which two actors played the retired Texas Rangers? In 'Gunsmoke', in which Kansas town is the series set?