Mark McGwire's brother, Jay, says he introduced the slugger to steroids in new book

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Mark McGwire's, St. Louis Cardinals bat during the home run record breaking season in 1998 in a game agaainst the New York Mets Stock Photo - Alamy

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Little Interest for Tell-All Book by Mark McGwire's Brother - The New York Times

Jay McGwire shares steroids secrets

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Mark McGwire's, St. Louis Cardinals bat during the home run record breaking season in 1998 in a game agaainst the New York Mets Stock Photo - Alamy

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Mark McGwire's brother, Jay, says he introduced the slugger to steroids in new book

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