Families of the Uvalde, Texas, school shooting victims slammed the head of the Texas Department of Public Safety, Col. Steven McCraw, at a public safety commission meeting in Austin on Thursday. The hearing marked the first public update since mid-July.
Brett Cross, guardian of 10-year-old Robb Elementary School victim Uziyah Garcia, said police waited outside as the children were "slaughtered."
Cross called for McCraw's immediate resignation, saying he "disgraced the state."
"If you’re a man of your word, you’ll resign," Cross said before he read the names of the 19 children and two teachers who were killed.
McCraw said at the hearing he won't resign.
He said if DPS as an institution failed the families, school or community, "then absolutely, I need to go." However, McCraw said, "DPS as an institution right now did not fail the community."
McCraw conceded that the gunman was always an active shooter and not a barricaded subject, citing the "post-Columbine" protocol.
"Ten minutes in, there was enough officers and information for things to be done," he admitted during the hearing.
Jesse Rizo, uncle of 9-year-old victim Jackie Cazares, said at the hearing that the aftermath of the shooting was "unacceptable" and was "adding insult to injury."
"Mr. McCraw, you have all the resources in the world," he said. "Yet you come out, your staff comes out, [providing] misinformation after misinformation. And it continues to happen."
"You basically lit a match and set the town on fire," he said.
"All we want are answers and full transparency," he said. "Take urgency and responsibility and tell us where you and your departments are on the investigation and how soon we'll have a complete report."
Kimberley Rubio, whose 10-year-old daughter, Lexi, was killed, also wants McCraw to resign.
"DPS officers failed Uvalde students and teachers and our community," Rubio told ABC News Thursday morning. "He is the leader, and sometimes when those below you fail, you have to take responsibility for that."
Democratic Texas state Sen. Roland Gutierrez, who addressed law enforcement at the start of the hearing, also called for McCraw's resignation.
The massacre "shattered" Texans' "illusion" that they could trust law enforcement, Gutierrez said at the hearing.
"These children waited 77 minutes" for help, he said. "Children trapped in a classroom had the courage to seek help by calling 911 over and over again. Law enforcement knew there were kids inside."
He went on, "We'll never know how many children could have been saved."
Gutierrez said the parents of the Uvalde victims "wake up every day from a dream thinking life's OK -- a minute later knowing that they're living in this horrible reality."
Nineteen children and two teachers were shot and killed with an AR-15-style rifle in the May 24 massacre. Nearly 400 officers rushed to the school, but didn't go into the classroom where the gunman was confined with his victims until over an hour later.
That slow response has led to a wide chorus of criticism for the responders. The school district's police chief was fired, as was one of the first Texas state troopers to arrive at the scene. A second trooper who left DPS to work for the Uvalde school system has since been terminated by the district.
Uvalde's entire school district police force has also been suspended.
Uvalde:365 is a continuing ABC News series reported from Uvalde and focused on the Texas community and how it forges on in the shadow of tragedy.
ABC News' Charlotte Greer contributed to this report.