One of the first school police officers to respond to a shooting massacre at Robb Elementary School in Uvalde, Texas, in 2022 pleaded not guilty Thursday to 29 counts of child endangerment, according to CNN and the Uvalde Leader-News.

Prosecutors in an indictment last month accuse Adrian Gonzales of hearing gunshots and "having time to respond to the shooter," but instead he "failed to engage, distract and delay the shooter and failed to act in a way to otherwise impede the shooter until after the shooter entered Rooms 111 and 112 of Robb Elementary School."

Indictment unsealedEx-Uvalde school police chief Arredondo didn't stop gunman 'hunting and shooting' students

On May 24, 2022, an 18-year-old gunman killed 19 children and two teachers in what became the deadliest school mass shooting in Texas. 

This is a developing story; check back for updates.