Sheriff's preliminary investigation also clarifies what happened during the 80-second attack.
Arapahoe High School
Colorado Governor stands behind the gun control laws passed by the legislature in the 2013 session but welcomes suggestions for improving or changing current Colorado laws.
In the wake of last week's shooting at Arapahoe High School, a trauma expert who's child was a student at Columbine during the shooting in 1999 offers advice and guidance.
Law enforcement officials work to pinpoint the motive for Friday's shooting that critically injured a 17-year-old senior Claire Davis.
Law enforcement officials late on Friday night identified the student gunman as 18-year-old Karl Halverson Pierson.