Zoisite
Zoisite was the third general of Queen Beryl. He was the cruelest of them all. He was basically a student of Kunzite, and it was more than a teacher/student relationship. Zoisite and Kunzite were both in love (this would make them both gay in the anime). His mission was to collect the seven nijizuishous (rainbow crystals) to make the ginzuishou (silver crystal) appear and he did his task.
Unfortunately because of his immense hatred towards Tuxedo Kamen, he killed him. Which was strictly a no no from Queen Beryl, so Queen Beryl killed him instantly. Tuxedo Kamen was brought back to life but was SUPER evil, and called himself "Prince Endymion champion of the Dark Force." (And for all you DiC people out there Zoisite is really a man in the Japanese series)