The inexplicable slaughter of 19 children and two teachers at Robb Elementary School propelled law enforcement officers, public officials and school administrators into the national spotlight.
Some grieving families are haunted by the chance some of the victims might have been saved had authorities not waited over an hour to enter the scene of carnage. At least two slain victims were still alive while police waited outside.
Officials have repeatedly changed their stories of what happened during the deadliest US school shooting in almost a decade. Now, several key figures are under public scrutiny for their actions before, during or after the May 24 massacre in two adjoining classrooms in Uvalde, Texas.
Here’s what we know about them – and how they’ve responded: