Many pay tribute to late 'Jeopardy!' host Alex Trebek

Notable reactions to the death of "Jeopardy!" host Alex Trebek:

"Alex wasn't just the best ever at what he did. He was also a lovely and deeply decent man, and I'm grateful for every minute I got to spend with him ... Thinking today about his family and his Jeopardy! family — which, in a way, included millions of us." — "Jeopardy!" contestant Ken Jennings on Twitter.

"So saddened to hear Alex Trebek has died. It was an honor to share the dinner hour with him. He fought his cancer battle valiantly," — ABC World News Tonight anchor David Muir on Twitter.

"It was one of the great privileges of my life to spend time with this courageous man while he fought the battle of his life. You will never be replaced in our hearts, Alex," — "Jeopardy!" contestant James Holzhauer on Twitter.

"Alex Trebek was kind enough to film a cameo for our film Free Guy last year despite his battle. He was gracious and funny. In addition to being curious, stalwart, generous, reassuring and of course, Canadian. We love you, Alex. And always will," — Actor Ryan Reynolds on Twitter.

"We mourn the loss of #alextrebek — a friend, a colleague, an icon. He graced us with warmth, wit & pure elegance, which is why we welcomed him into our homes night after night, year after year. We are deeply saddened for his wife Jean, his family & millions of Jeopardy fans," — Walt Disney Co. executive chairman Robert Iger on Twitter.

"My heart breaks for the Trebek family upon hearing this heartbreaking news. Alex Trebek was a legend. There was no one like him. Kind, elegant, talented, good. Heaven just became brighter and we here on earth mourn him," — Maria Shriver on Twitter.

"We have lost an icon. Almost every night for more than three decades, Alex Trebek entertained and educated millions around the world, instilling in so many of us a love for trivia. My deepest condolences to his family, friends, and all who are mourning this tremendous loss," — Canadian Prime Minister Justin Trudeau on Twitter.

"Couldn't we have one nice weekend? A kind gentleman whose excellence was so consistent, it was easy to take for granted. Rest well, Mr. Trebek," — Jimmy Kimmel on Twitter.

"RIP Alex Trebek. A true, true gentleman and courageous hero. May flights of angels sing thee to thy rest," —Actor Viola Davis on Twitter.

"I'm so saddened that Alex Trebek has passed. Growing up, he made me feel like my nerdiness was valuable and I loved learning from watching jeopardy. It was our family's nightly pleasure," — TV personality and author Padma Lakshmi on Twitter.

"Alex Trebek hosted Jeopardy for 36 years. What an incredible career and remarkable life. I'm sending love to his family and fans." — Comedian Ellen DeGeneres on Twitter.

"I'm honored to have known Alex Trebek, have a few meals with him, have him share some of his wisdom. On the @TCM cruise, he got me to swim w/ the dolphins. No one else could've done that. He was the best at what he did," — TCM host Ben Mankiewicz on Twitter.