Simpson, who did not testify during his trial, said in interviews after his arrest he had been recovering personal items stolen from his trophy room, and said he was unaware that the men with him were armed.
But four of the accomplices agreed plea deals and testified against Simpson.
Prosecutors said two of the men with him were armed and one of those men said Simpson asked him to bring a gun.
Simpson showed little emotion as officers handcuffed him and walked him out of the courtroom while Carmelita Durio, his sister, sobbed behind him.
Las Vegas police officers were heard in the recordings chuckling over Simpson's misfortune and crowing that if Los Angeles had failed to "get" him, they would.
During jury selection, Simpson's lawyers expressed fears that people who believed he got away with murder might see this case as a chance to put him behind bars.
Thomas Riccio, a memorabilia dealer who arranged and secretly recorded the hotel-room confrontation, said he made $210,000 from the media for the tapes.