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Sean Milliken, who starred on TLC’s “My 600-lb Life,” has passed away at age 29.

Milliken, whose journey from California to Houston to undergo weight loss surgery was captured by TLC cameras in 2016, died Sunday.

“TLC is saddened to share that Sean Milliken has passed away,” the network said in a statement. “Viewers first met Sean in 2016 on ‘My 600-lb Life’ when he weighed over 900-lbs. Over the course of his weight loss journey, he victoriously lost over 400-lbs.”

His father, Matt, said in a private Facebook post (via TMZ) that Sean died of complications from an infection, and that “he was having problems with his breathing, they were able to resuscitate him and a short time later his heart stopped.”

Sean had been in the hospital a few days before he died.

TLC filmed again with Sean following his mother’s death on the network’s “Where Are They Now” series last year.