A 28-year-old California man walked into the Santa Clara County jail and told deputies he'd killed someone. They didn't believe him. So he went out and killed again. That's not a synopsis of a horror film — it's what prosecutors say actually happened in San Jose, and it lays bare the complete collapse of every system designed to stop a killer before the bodies pile up.

Marcelino Castro now sits in the Santa Clara County Main Jail on suspicion of murder. According to the Los Angeles Times, which reviewed his criminal complaint, Castro confessed to two homicides and led police to both corpses. The first victim knew Castro and was killed on Sept. 13. The second was a total stranger, murdered days later. Santa Clara County Deputy Dist. Atty. Michael Gadeberg didn't mince words: "The fact that he would progress to what appears to be a total stranger is certainly concerning and suggests there may not be a conventional motive other than compulsion to kill." Asked whether there could be more victims, Gadeberg said he "wouldn't be shocked."

The details are grim. Castro told officers he buried his first victim in a shallow grave in a creek bed near Tamien Station, according to the complaint. Police used shovels to uncover a human foot, leg, and knee. The body had a laceration across the neck. For the second killing, Castro said he lured a stranger to a secluded grassy area to smoke, then strangled him and bludgeoned him with a rock. He wrapped the body in a red tent and dropped it near the shore of the Guadalupe River.

But the most damning fact isn't in the complaint — it's what happened in between. Gadeberg told the Times that Castro allegedly tried to turn himself in at the Main County Jail in San Jose, but when deputies didn't believe him, he flagged down someone at police headquarters. A man walked into a government building and said he'd killed a person, and the people staffing that building sent him on his way. He then took another life.

No official has answered for that failure. No sheriff's spokesperson has explained how a confessed killer walked out of a jail. No mental health official has addressed what, if any, evaluation Castro received before his initial release or during any prior contact with the system. The identities of the dead haven't even been released yet.

The Times framed the story around the "unusual" nature of the confession and the escalating violence. Fair enough — the facts are unusual. What's not unusual is the failure. Every level of the public safety and mental health apparatus in Santa Clara County had a chance to intervene. A man with what a prosecutor describes as a "compulsion to kill" was free to act on it, and the government's own employees waved him off when he handed them a confession.

The second victim didn't know Castro. He was a stranger in the wrong place. He is dead because the system designed to protect him didn't even try.

How many people in how many jurisdictions have tried to confess, tried to get help, tried to warn someone — and been turned away? Castro found his way back to police headquarters. Plenty of others never bother making the second trip.