Mark Krueger was an amateur photographer who testified as a rebuttal witness for the prosecution, called by Marcia Clark. He had been on the sidelines at Soldier Field in Chicago on December 29, 1990, shooting photos of a Bears–Chiefs game for his stepfather's newspaper. His photographs apparently became relevant evidence late in the trial, significant enough to prompt both direct and redirect examination by Clark and cross-examination by defense attorney Robert Blasier — all in a single day of testimony during the rebuttal phase.