She had brain cancer since October 2018, and she detailed a little part of her cancer journey here: https://peanutbutterandcancer.com/
Heidi was 38.
Here is the article with video from 9NEWS: https://www.9news.com/article/news/local/remembering-heidi-mcguire-former-9newser-passes-away-at-38/73-113d8b29-7dfb-4f18-993c-5301d381eff7
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(Photo: 9NEWS & Channel 20--KUSA & KTVD)