The snowy morning on April 16, 2007, in Blacksburg, Va., will be known as the deadliest shooting in American history. It is a tragedy that defies description. Below is a summary of the events of that morning and the accompanying coverage.

Suspect Identified in Four School Bomb Threat

A 16-year-old teenager is suspected of making the bomb threats that closed four schools in the Rochester district on Monday. Deputies say he detailed the threat in an e-mail. Oakland County Sheriff Michael Bouchard says that student could now face...