She thought she was going to die from the 643 pounds she was carrying around.

Although her family, including four daughters, hoped she would recover, sadly McMillian succumbed to complications.

“My heart could give out at any time and I can feel the weight weighing me down.

Coliesa McMillian

I have to be here for my kids,” she added.

According toTMZ, she would go on to suffer a heart attack pre-surgery.

Avideoposted to TLC’s Twitter account shows McMillian admitting this took place when she was only 39.

Coliesa McMillian

Our deepest condolences to her family at this difficult time."