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ST. LOUIS A 20-year-old St. Louis man convicted in the knockout game murder of a Vietnamese immigrant was sentenced to life in prison on Thursday.

According to the St. Louis Circuit Attorney s office, Elex Murphy was given life in prison plus 25 years.

Murphy was convicted April 10 of second-degree murder, first-degree assault and armed criminal action in the April 2011 death of 72-year-old Hoang Nguyen.

The jury initially rejected the prosecution s request for a first-degree murder verdict.

Nguyen was walking home with his wife when he was attacked by a four teenagers. Police say the couple did nothing to provoke the attack.

In the knockout game, people are picked at random and beaten. The attacks are sometimes captured on cell phone video, and some have been posted on social media sites.

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