Twenty-five years ago, Michelle DiManna was at Columbine High School grading papers and talking to a colleague when she heard students screaming in terror.
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Twenty-five years ago, Michelle DiManna was at Columbine High School grading papers and talking to a colleague when she heard students screaming in terror.
DENVER — Twenty-five years ago, Michelle DiManna sat in the math office at Columbine High School grading papers and talking to a colleague when she heard students screaming in terror.