We now know what happened to "Elizabeth's dad." As you may know, Chuck Potthast, who became a fan favorite on 90 Day Fiancé during his daughter Elizabeth Castravet's journey to marry her long-distance lover Andrei Castravet, passed away at 64 last year. Elizabeth announced the heartbreaking news on Instagram in November, saying her family was completely shattered after his death. While she has not revealed how he died, TMZ is finally giving us an answer.