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we heard the screaming. >> one car on the north side. >> reporter: now new details are merging showing pearson was able to get into the building easily because a door that should have been locked wasn't. according to the arapahoe county sheriff. >> we know that the doorway on the north side that the murderer entered is supposed to be locked. unfortunately, it rarely is because it is more convenient for people to come and go from that area and not have to be obstructed by a locked door. >> reporter: pearson fired several shots, one of them fatally wounding 17-year-old clare davis. the arapahoe sheriff released new details about how pearson planned his shooting spree, saying he passed the background check and legally bought the shotgun on december 6, continuously acquired ammunition until the morning of the shooting and then tried to mask his intentions. >> we know that on the morning of december 13th, the murderer