Da'Jon Hayes-Burr, the 15-year-old Kentucky boy who stepped in when grown men wouldn't — defending a 12-year-old girl from a 45-year-old sexual predator — was shot and killed Saturday night in Louisville, and a 14-year-old has been booked on a murder count.

This is what institutional failure looks like when it costs a life. The system failed Hayes-Burr twice: first by leaving a predator free to harass a child in public, forcing a teenager to do a man's job; then by failing to keep that same teenager safe in his own neighborhood.

In April, Hayes-Burr made headlines after he and other teenage boys confronted Vasilis Sakellardis, 45, who had directed a sexual comment at a 12-year-old girl leaving a fireworks show. The girl's mother, Kristyn Stasel, told the man her daughter was 12. His reply, according to Stasel: "Never too young to have some fun." She screamed for help. She yelled, "Pedophile! Pedophile!" The grown men around them did nothing.

Hayes-Burr heard the cries and acted. He and the other boys threw Sakellardis to the ground. During the struggle, Sakellardis stabbed Hayes-Burr. Police eventually tackled and arrested the attacker. The teen spent a night in the hospital.

Afterward, Hayes-Burr told a local station he never imagined being in that position — but stepped in after realizing "a lot of grown men around … weren't going to do [anything]." He added: "So, we had to do something."

Stasel said the boys "were raised right." The Louisville city council awarded Hayes-Burr a proclamation citing his "extraordinary courage, compassion and selflessness" and "valor far beyond his years." Governor Andy Beshear sent a letter and a ceremonial challenge coin thanking the teen for his bravery.

Saturday night, Hayes-Burr was shot in Louisville's Shawnee neighborhood. Police have not released a motive. The suspect is 14.

Louisville council member Crystal Bast put it plainly: "We have babies out here killing babies. Something has to change."

She's right. But the question neither she nor the governor answered is what, exactly, changes. A 45-year-old man felt comfortable making lewd comments to a 12-year-old in a crowd. The adults in that crowd froze. A child did the work. That child survived a stabbing — only to be gunned down months later by another child. Ceremonial proclamations and challenge coins didn't keep Da'Jon Hayes-Burr alive. The institutions that should have protected that 12-year-old girl before a teenager had to step up are the same ones that couldn't keep a 15-year-old safe in his own streets. The predators walk. The honorable are buried.