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.
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.