Prosecutor Ken Kupfner loaded dummy bullets into a 30-round magazine in a hushed courtroom Friday morning. He slowly pushed each bullet into the magazine — the same type of magazine used by the man who carried out a mass shooting at a Boulder King Soopers grocery store in 2021,

Ahmad Alissa, who has schizophrenia, pleaded not guilty by reason of insanity for killing 10 people inside the supermarket in March 2021