The cause of his death wasn't released, but he had some health issues, like cirrhosis of the liver and sepsis.
TLC posted a message remembering King.
“TLC was deeply saddened by the loss of James King, who shared his weight-loss journey on My 600lb Life. Our thoughts and prayers are with his family at this difficult time.”
King was seen in the fifth season of "My 600-lb. Life," which first aired in March 2017. At that time, King weighed about 800 pounds.
He had been working to get down to 600 pounds so that he could have gastric bypass surgery. But when he returned to the show the following year, he weighed 840 pounds.
Deadline writes that King was born in Paducah, Kentucky in June 1970. King was open about his childhood, saying that his mother was an alcoholic; his dad took care of him and his brother.
“I only saw my mother three times during my childhood, and she was drunk every time, so my dad took care of us," King said on the show.
After he had a reunion with his mom, he said he “felt that something that had been missing from my life wasn’t missing as much anymore.”
But his mother died only a few months after that. According to Deadline, King, at his mother's funeral, said, “We got a phone call that our family home had burned down, and I lost just about everything I had in a single day.”
"I was devastated because I missed the chance to reconnect with my mom," he says in a TLC video.
After the funeral and the fire is when depression set in, which was debilitating enough that he couldn't even attend school.
“It seems like all I wanted to do was eat," he said. "Food was what had made me safe all these years growing up. So that's what I turned to."
King was married to his wife, Lisa Raisor King, and he had four daughters and two sons, and 19 grandchildren.
King's obituary listed some of his passions, including sports and fishing.
“James loved sports, especially wrestling, hockey and baseball. James’ favorite team to cheer for was the Chicago Cubs. His other hobbies included fishing and communicating to friends across the country on his CB Radio under the handle ‘Cracker Jack.' ”
"My 600-lb Life" has been in production since 2012, and follows people who are obese and seeking gastric bypass surgery.