Alex Trebek’s final episode of “Jeopardy!” will air Friday night -- ahead of the show a moving tribute was shared with the public. His final five episodes were all taped in late October. READ: Here’s when Alex Trebek’s final ‘Jeopardy!’ episodes will air and what happens nextNext Monday, former champion Ken Jennings will appear as the first guest host on the show. Several news outlets are reporting that former news anchor Katie Couric has also signed on as a guest host. Watch the tribute to Alex Trebek below:Read more