Alex Trebek's cancer diagnosis prompts outpouring of support

Following news that Alex Trebek has been diagnosed with stage 4 pancreatic cancer, celebrities and former "Jeopardy" contestants took to social media to share messages of support for the longtime "Jeopardy" host.

"Wheel of Fortune" host Pat Sajak
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"Wheel of Fortune" host Vanna White



"Jeopardy" champ Ken Jennings





Walt Disney Company CEO Bob Iger



Dr. Phil McGraw
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Canadian Prime Minister Justin Trudeau



Dr. Oz




Ken Jeong


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David Muir



Chris Harrison



Recent "Jeopardy" contestant Brad Rutter



Children's television program "Arthur"