The massacre at Robb Elementary School in Uvalde was one of the deadliest school shootings in US history.
More than a year later, findings from a state-led investigation into the chaotic response have yet to be released. Most officers involved in the response have declined to talk publicly.
But ProPublica, Frontline
& Texas Tribune gained access to materials from this investigation, including interviews with officers, hours of body-cam footage & 911 calls.
Debuts Tues., Dec 5 on PBS: