`` This in fact is your last time tuning in to 'The Colbert Report . ' Colbert final show aired 2015 . He said goodbye with a star-studded sing-a-long . Stephen Colbert 's will take over `` Grimmy '' in Thursday .
Colbert final show aired 2015 . He said goodbye with a star-studded sing-a-long . Stephen Colbert 's will take over `` Grimmy '' in Thursday .