Simpson, 65, convicted for armed robbery and kidnapping in 2008 and sentenced to nine years in prison, testified for several hours Wednesday at a hearing in Las Vegas to determine if his conviction can be overturned, NBC News reported.
Simpson and his new attorneys must convince a judge that Simpson's former attorney, Yale Galanter, did shoddy work, never revealed a conflict of interest and didn't inform Simpson of a possible plea deal, KTNV-TV, Las Vegas, said.
Wednesday's actions in court were unprecedented. Simpson didn't testify during the robbery trial or at the 1995 trial in which he was acquitted of killing his ex-wide and her friend.
Simpson, appearing grayer and heavier than in the past, recounted a day drinking with friends in a Las Vegas hotel, followed by a chaotic face-off with memorabilia dealers, holding allegedly stolen merchandise.
Simpson said guns were "never a subject" as he and five colleagues discussed visiting the dealers' hotel rooms to view merchandise he claimed was stolen from him, and said he didn't see anyone exhibit a gun. His purpose in visiting the rooms was to reclaim the memorabilia, saying it belonged to his family and "not to some guy selling at a hotel room in Vegas."