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ST. LOUIS (AP) - A Cole County judge has thrown out the conviction of a St. Louis man imprisoned for two decades in a teenager's dance hall murder, citing testimony by the victim's identical twin linking another suspect to the fatal shooting.

Circuit Judge Daniel Green ruled Wednesday that 34-year-old Anthony Williams must either be released from a Jefferson City state prison or return to St. Louis for another trial should Circuit Attorney Jennifer Joyce refile charges.

Williams is serving a life sentence without parole in the shooting of 14-year-old Cortez Andrews during a post-dance brawl. Williams was also 14 then but stood trial as an adult. A city jury found guilty of first-degree murder.

The ruling repeatedly faults prosecutors for not providing Williams's previous lawyers with evidence that could have helped his defense.

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