In 'Justified', which actor played U.S. Marshal Raylan Givens?

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 'The Shield', which actor played corrupt detective Vic Mackey? 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? Which Western series ran for 20 seasons on CBS, from 1955 to 1975?