Kelly Mason was featured in the seventh season of "My 600-lb. Life" in 2019. The North Carolina native weighed over 700 pounds, and was plagued with severe medical conditions including high blood pressure, diabetes, blood clots, arthritis, and even congestive heart failure, according to Distractify. Audiences rooted for Mason as they watched her lose the first 100 pounds after being committed to the hospital by Dr. Now, and then even more so as they watched her stick to her goal and lose an additional 220 pounds after being approved for weight loss surgery.

Tragically, Mason died in her sleep due to cardiac arrest, making her the second participant on the show to die during its filming. When Dr. Now spoke on Mason's death, he specified that it was "not a result of her going back to her old habits," and that despite her hard work the damage to her heart up to this point was just too severe."