had thyroid cancer. >> dr. voigt saw this and brought it to my attention and now i'll be treated for it. >> reporter: and it's not the first time an eagle-eyed hgtv viewer noticed something and took action. in 2013, a nurse spotted a lump on the neck of tarek el moussa, star of "flip or flop." she reached out to el moussa, who was diagnosed and successfully treated for cancer. as for nicole, she's optimistic. >> it's just a miracle, in my opinion, that he happened to see this on television. i can't express how grateful and thankful i am. >> reporter: david, tonight, nicole is busy planning her treatment with her doctors, and is staying in touch with dr. voigt. david? >> thanks to that doctor tonight. all right, eva, thank you. when we come back, that deadly building collapse. the workers caught inside. news from the scene. and developments tonight about the driver speeding onto a little league baseball field. those players running for cover. back in a moment.