He announced his retirement on December 2, 2006 after the K-1 World GP Final tournament in Tokyo Dome, Japan.
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In the episode he participated in, players sat in a library and flipped over cards in a Russian roulette manner.
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Hoost was also present as a cornerman for UFC fighter Antoni Hardonk in Hardonk's UFC 85 bout with Eddie Sanchez, his UFC 92 win over Mike Wessel, and his UFC 97 loss to Cheick Kongo.
Ernesto Zedillo | Ernesto Rossi | Ernesto Lecuona | Ernesto Sábato | Ernesto Neto | Società Italiana Ernesto Breda | Ernesto Tomasini | Ernesto Rossi (politician) | Ernesto Pérez Balladares | Ernesto Samper | Ernesto Sabato | Ernesto Nieto | Ernesto Nathan Rogers | Ernesto Laguardia | Ernesto Juan Castellanos | Ernesto Hoost | Ernesto Herrera | Ernesto España | Ernesto De Pascale | Ernesto "Che" Guevara | Ernesto Castano | Ernesto Burzagli | Ernesto Bellandi | Ricardo Ernesto Montes i Bradley | Luis Ernesto Tapia | Luis Ernesto Derbez | José Ernesto Sosa | Ernesto's Burning | Ernesto Pujol | Ernesto Pérez Acosta |
On September 23, 2005 at the K-1 World GP Final Eliminations in Osaka Dome, Japan he faced Rickard Nordstrand from Sweden the replacement fighter of four time World Champion Ernesto Hoost who had to pull out due to a leg injury.
Born in Melbourne Australia of Greeks ethnicity, Longinidis is one of the few fighters to have won World titles in three different styles, International Rules Kickboxing, Full Contact and Muay Thai, others being Fred Royers and Ernesto Hoost.