Esteban Nunez, from left, Ryan Jett, Rafael Garcia and Leshanor Thomas are arraigned in the stabbing death of Luis Dos Santos, 22 in San Diego County Superior Court. They each pleaded not guilty to one count of murder and three of assault with a deadly weapon. (Mark Boster / Los Angeles Times)

Fabian Nunez and his wife, Maria, stand behind defense attorneys at a news conference after the arraignment of their son Esteban. (Mark Boster / Los Angeles Times)
Nunez, Jett, Garcia and Thomas at their arraignment in San Diego County Superior Court. Prosecutors allege that they were angry at being turned away from a fraternity party and attacked victim Luis Dos Santos and four of his friends. Defense attorneys said Nunez and his friends acted in self-defense. (Mark Boster / Los Angeles Times)
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Esteban Nunez is led into San Diego County Superior Court to face charges in the fatal stabbing of Luis Dos Santos on Oct. 4. Nunez is a business student at Sacramento City College. (Mark Boster / Los Angeles Times)