Karl Pierson's online image and more fallout from Arapahoe High shooting

Update: Last night, the Littleton School District announced that Arapahoe High School, where a Friday shooting left student Claire Davis fighting for her life (see our previous coverage below), will be closed through winter break. We've got the full schedule for students wishing to retrieve their belongings below.

In the meantime, the social media footprint of Karl Pierson, who took his own life after shooting Davis, continues to be erased -- but we've got material from Facebook, including a group to which he belonged, that gives more insight into what he was like.