Who will replace Alex Trebek on 'Jeopardy!'? A rundown of the celebrities taking turns as guest hosts
Alex Trebek's final 'Jeopardy!' episodes will air this week and include a moving speech by late host
Alex Trebek, a lifelong conservationist, quietly donated a large parcel of land years ago
Celebrities remember 'Jeopardy!' host Alex Trebek
These football questions stumped all three 'Jeopardy' contestants
