This is such heartbreaking news to hear. Chuck Potthast, a star from 90 Day Fiancé, has sadly passed away. On Instagram Sunday, his daughter Elizabeth Castravet and her husband Andrei Castravet announced the news in a joint post, which read: "Two weeks ago, tragedy struck our family and it has left us completely shattered. My sweet, loving, and caring dad went to heaven. We're trying to figure out how to navigate our lives and move forward without him. Please respect our privacy during this extremely difficult time.