In the history of Miss Universe, there are 3 titleholders that were dethroned/resigned due to the following reasons mentioned below:
MISS UNIVERSE 1952
Armi Kuusela, Finland
Armi Kuusela of Finland, who became the first Miss Universe in 1952, gave up her crown shortly before her one year reign as the Miss Universe ended. The beauty from Finland did so as she wished to get married to a Filipino tycoon, Virgilio Hilario.Although she became the first international beauty queen to voluntarily relinquish her crown, she was allowed to retain her title by pageant organizers. No formal replacement have been made.
MISS UNIVERSE 1974
Amparo Munoz, Spain
After winning the Miss Universe crown in 1974 Amparo Muñoz of Spain, relinquishes her title six months into her reign. The first runner-up Miss Wales Helen Morgan became ineligible to succeed her because by then Ms. Morgan had won the Miss World 1974 pageant (where she represented the United Kingdom). By a twist of fate, Ms. Morgan ends up relinquishing the Miss World title several days into her reign when it was revealed she was an unmarried mother. With the resignation of Amparo Munoz and with Helen Morgan deemed ineligible to succeed her, it was unclear why the title was not offered to the 2nd runner-up (also Miss Photogenic), Miss Finland Johanna Raunio, a crowd-favorite at the pageant. Amparo Munoz, the first Miss Universe crown for Spain is dethroned for her violent temper and behavior. No replacement is made.
MISS UNIVERSE 2002
Oxana Federova, Russia