Reaction to the death of long-time "Jeopardy!" host Alex Trebek came pouring in from Ottawa on Sunday.

Trebek died at the age of 80. A cause of death was not immediately made public.

Trebek revealed in March 2019 that he had been battling Stage 4 pancreatic cancer.

The Sudbury, Ont. native attended the University of Ottawa, graduating with a degree in philosophy in 1961. After finding fame on "Jeopardy!" he would return to Ottawa, donating millions to the university. An alumni hall is named in his honour.

"It is with great sadness that uOttawa acknowledges the passing of Alex Trebek, one of our most beloved alumni and one of our community’s most passionate supporters," uOttawa President Jacques Frémont said in a statement Sunday afternoon. "Our heartfelt condolences to his beloved wife Jean and their children Emily and Matthew."

In 2016, Trebek was awarded the Key to the City of Ottawa by Mayor Jim Watson.

"Alex Trebek does exceptional work in the community, is a cultural icon and someone all Ottawa residents are proud to consider one of their own," Mayor Jim Watson said at the time.

On Sunday, Watson said "the world lost an outstanding Canadian."

The world lost an outstanding Canadian this morning.

Le monde a perdu un Canadien exceptionnel ce matin.

Please see my statement following the passing of Alex Trebek: pic.twitter.com/8cLHW7igY3

— Jim Watson (@JimWatsonOttawa) November 8, 2020

"Alex Trebek was an inspiration to so many around North America. He dedicated his life to the pursuit of knowledge and higher education," Watson said in a statement on Sunday. "Throughout his long and illustrious career, he gave back to his alma mater, the University of Ottawa, and other organizations that help those in need in our community. Despite his success, Alex remained humble and never forgot where he came from or what truly matters in life."

Watson said the flag outside the Heritage Building at Ottawa City Hall will be lowered to half-mast until sunset on Wednesday.

Trebek sat down with CTV Ottawa's Patricia Boal in 2019 to discuss the difficult days since his cancer diagnosis and why Ottawa still feels like home.

Trebek made a guest appearance in October at the 2020 NHL Draft, announcing the Ottawa Senators' selection of Tim Stuetzle. The Senators had just marked one month since that moment on Friday.

#FBF to 1⃣ month ago today when the legendary Alex Trebek officially made Tim Stuetzle an Ottawa Senator! pic.twitter.com/C6E7DvZimE

— Ottawa Senators (@Senators) November 6, 2020

The Senators reflected Trebek's death in a statement Sunday afternoon. 

"Alex was a true and much beloved Canadian icon, and a very special member of the Ottawa Senators family," said Senators owner Eugene Melnyk. "We will always be grateful to Alex for the special role he played in announcing the Senators’ first draft choice this year. For his legions of fans, Alex’s class and professionalism will endure as will his love for our game. Thank you, Alex, for your legacy. The Senators family and the entire Capital Region will miss you."

Stuetzle posted his own message to Instagram on Sunday, saying he had been looking forward to meeting "the person who drafted me" and was saddened to hear of Trebek's passing.

        View this post on Instagram                  

I am deeply sorry to hear about the death of Alex Trebek. I was looking forward to meet the person who drafted me. He shared this unforgettable moment with me and I am very thankful for that���� With my deepest condolences �� REST IN PEACE MR.TREBEK.❤️✝️

A post shared by Tim Stützle (@timstuetzle8) on Nov 8, 2020 at 11:52am PST

Prime Minister Justin Trudeau tweeted about Trebek's passing, saying "we have lost an icon." His full statement included references to stumping contestants with clues about Canada and "the night Alex showed up without his trademark moustache."

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. pic.twitter.com/XoobAfJwBv

— Justin Trudeau (@JustinTrudeau) November 8, 2020

Please read my full statement on the passing of Alex Trebek: https://t.co/pnAsoFSzx5

— Justin Trudeau (@JustinTrudeau) November 8, 2020

Ontario Premier Doug Ford also tweeted about the passing of the Sudbury native on Sunday.

I’m saddened to hear about the passing of Alex Trebek, a true Canadian legend. My thoughts and condolences go out to the Trebek family during this difficult time. Alex touched so many lives. He will be truly missed. https://t.co/Bt0KhuHaT8

— Doug Ford (@fordnation) November 8, 2020

Ford's comments were echoed by Nepean MPP and Ontario Cabinet Minister Lisa MacLeod.

A great Ontarian has left us. Born in Sudbury, educated in Ottawa and sharing his talent from Toronto to the entire nation, Canadians will miss Alex Trebek. An international icon has gone but will never be forgotten by a proud country. https://t.co/4Nvm4QB0SK

— Lisa MacLeod (@MacLeodLisa) November 8, 2020

MAJIC 100 host and cancer survivor "Stuntman" Stu Schwartz shared a memory of meeting Trebek on Twitter Sunday.

2015 I was asked to host a trivia event and Alex Trebek was sitting in the front row. Naturally I was nervous but made it through. He complemented me afterwards and I left 3 feet higher. RIP Mr. Trebek, you gave it a hell of a fight �� pic.twitter.com/3VBUQsyGYO

— Stu Schwartz (@StuntmanStu)  November 8, 2020