Somebody mentioned here Summer and Cindy G; they both died on cancer (not cardial desease), not certain how much the obesity contributed on this, though.
But Summer was also in her last few year not as big as she used to be, around 2007 - 2010. She covered when often the head, which indicated chemo-therapy, as her hair got very thin and lose.
She was maybe around fourty or over this, at the time of death in 2015 or 2017.
Cindy G was I think 43 when she died in April 2008, but had to use a wellchair because of her sickness.
Chelle (Rachel) from Canada on the other hand was just 27, but more than two times as big as Kass and somebody claimed that she was chain-smoker as well. Though perhaps a half year or so before the death in 2013 (maybe August) was she considering about lifestyle according to Heather.
Ariel was in her twenties as well, but already retiredin 2006 and was supposed to have lost half of her weight, but got a nerve desease which made her unable to walk.