Brian McNamee

Brian McNamee arrives on Capitol Hill on Thursday.

April 16, 2012 5:21:20 PM PDT
The strength trainer worked out closely with Clemens for a decade, helping mold him into one of the most feared power pitchers in the major leagues even into middle age.

McNamee also says he injected Clemens with steroids and human growth hormone and saved the needles, which will be evidence at trial. He's the only person to say he witnessed Clemens using drugs and will be the prosecution's most important witness.

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