Caleb Willingham, the husband of 1000-Lb Sisters star Tammy Slaton, has died.

Tammy confirmed his passing July 1 on her Instagram page. The cause of his death was not revealed. Caleb was 40, per public records.

"Rip sweet angel," Tammy wrote, alongside photos of herself embracing the Evansville, Indiana native in front of a Christmas tree. "You will forever be missed and loved so much."

The 36-year-old added, "Thank you Caleb for showing me real love and happiness."

TLC also released a statement to E! News, saying, "We are deeply saddened to learn of Caleb Willingham's passing.  Our condolences go out to Tammy, his family and friends at this difficult time."

Tammy and Caleb met last year at the Windsor Lane Rehabilitation Center in Gibsonburg, Ohio while undergoing weight loss rehab, during which she lost at least 180 pounds. Her husband proposed to her in the parking lot in October and the two tied the knot in a small wedding in the facility in November. The event was documented on the finale of season four of 1000-Lb Sisters, which aired in March.

In January, Tammy told E! News that  marrying Caleb was "the best thing that's ever happened to me," adding, "God truly blessed me."

Following Caleb's death, Tammy told People in a statement that Caleb "was my best friend and I loved him dearly."

She added, "When I met Caleb he became my guardian angel and now he really is watching over me. Our families appreciate everyone's sympathy and ask that you respect our privacy at this time."