(CBS News) A former neighbor of George Zimmerman testified he saw two men in a “tussle” outside his home the night of Feb. 26, 2012, and said he now believes the person on top in the altercation – which would moments later turn fatal – was Trayvon Martin.

In key testimony, he also said he believes George Zimmerman was the person yelling for help.

John Good took the stand Friday in the fifth day of testimony in the Zimmerman’s second-degree murder trial. The former neighborhood watch captain is charged with shooting the unarmed teen as he was walking back to his father’s fiancee’s home through a Sanford, Fla. gated community.

Should George Zimmerman be convicted to prevent race riots?

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