Propping open the door , he exploded tear gas canisters in the theater , then began shooting , according to witnesses . Jury selection in James ' trial is set to start next week , court officials says . That process could take 2 - 3 months ; the trial may last 4 - 6 months , a spokesman says . Holmes faces 166 charges tied to a 2012 mass shooting at a Colorado movie theater .
Jury selection in James ' trial is set to start next week , court officials says . That process could take 2 - 3 months ; the trial may last 4 - 6 months , a spokesman says . Holmes faces 166 charges tied to a 2012 mass shooting at a Colorado movie theater .