Dahle, who teaches speech and debate and government economics, told \"GMA\" that he didn't want Gjoraas' wife to worry about the house once her husband was gone.

\"We all just showed up and put it together,\" Dahle said. \"Tim's just fantastic. If you talk to any of his former students, they loved having him as a teacher -- just a great heart, and a great personality.\"

\"PHOTO:
Tim Gjoraas
PHOTO: Tim Gjoraas, a South Dakota teacher who has been fighting cancer, poses with his wife Lisa and hi three children, Alexis, 20, Kia, 18 and Kaden, 14.
>

Gjoraas said he, his wife and his three kids from a previous marriage -- Alexis, 20, Kia, 18, and Kaden, 14 -- have lived in their house for quite some time and wanted to paint it blue.

Gjoraas and his pals started the job Sept. 26 and finished in a day.

\"I don't get out of the house very much, so it's nice to have people come and share old stories,\" Gjoraas said. \"This wasn't the first time my teacher friends got together to do something ... I would definitely like to thank everybody for that love.\"

Gjoraas posted photos of the kind act on Facebook and soon, news outlets shared his story.

Gjoraas said his advice to others is to not waste the time you've been given with your family.

\"PHOTO:
Tim Gjoraas
PHOTO: For 22 years, Tim Gjoraas (front row, black shirt) taught anatomy and physiology at Washington High School in Sioux Falls. The 45-year-old father of three was diagnosed with colon cancer last year and friends stepped in to help him paint his home.
>

The Centers for Disease Control and Preventions says regular screening for colon cancer should begin at age 50. Gjoraas hopes doctors will start testing earlier, at age 40.

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