He saw Nicole McGuinness on an episode of the HGTV show, "Beachfront Bargain Hunt", and noticed a small bump on the side of her throat.
Oddly, this is not the first time an HGTV viewer has spotted a cancerous lump.
"Dr. Voigt saw this, and brought it to my attention, and now I'll be treated for it", she told ABC News.
Voigt immediately realized it could be serious and the woman had to see a doctor, though he had no idea who she was - and the program never mentioned her last name.
"I am watching a tv show and notice this woman has a left thyroid mass". She needs a sonogram and fine needle biopsy.
Voigt used Facebook and a clip of the show to track her down and advised her to go to the doctor. "I wonder if she knows and hope it's benign", the doctor at NYU Langone Medical Center wrote.
The news eventually got back to McGuinness, who lives in Havelock.
McGuinness is scheduled to meet with doctors at Duke late this week to discuss the next step in her treatment process.
Voigt let her know she needed a sonogram and a biopsy.
She was also diagnosed with brain cancer in 2015 but has since received a clear MRI.
About one month later, Voigt posted an update explaining he found the woman and alerted her to the lump. McGuinness says she learned she has thyroid cancer. "I can't express how grateful and thankful I am".