Urbandale Police Chief Ross McCarty told reporters that Urbandale officers removed Scott Michael Greene from the football game. McCarty says some spectators complained after Greene waved the flag in front of spectators who are minorities.
Greene shot a video of the Oct. 14 incident that he posted online.
He complained to officers that his constitutional rights were being violated because they were throwing him out, but police told him he was on private property and needed to leave.
Greene is suspected in the shooting deaths of Urbandale officer Justin Martin and Des Moines Sgt. Anthony "Tony" Beminio.