A 20-year-old man forced his way into an Arcadia home Thursday morning and shot his teenage girlfriend dead before fleeing to Pasadena and turning the gun on himself — another young life erased while the system that was supposed to protect her stood by.

Paul Anthony Cruz Jr. was discovered on a Pasadena sidewalk with a self-inflicted gunshot wound around 12:30 p.m., roughly 90 minutes after he allegedly murdered the girl inside a residence on the 800 block of West Huntington Drive. He survived and remained in critical condition as of Thursday evening. The victim's name has not been released. For her family, whatever protection the system offered came too late.

Arcadia police responded to a call about a possible shooting just before 11 a.m. The caller reported a man inside the residence who had fired a gun. Officers arrived to find the girl suffering from a gunshot wound. She was pronounced dead at the scene. Cruz had already fled.

The Los Angeles County Sheriff's Department confirmed Cruz was in a dating relationship with the victim and had "forced entry" into the home. What triggered the attack, whether there were prior domestic incidents, whether red flags were missed — those questions remain unanswered. The Sheriff's Department Homicide Division is handling the investigation.

Cruz fled to Pasadena, where the violence ended the way it started — with a gun in broad daylight. Michael Amini, manager at Alliance Auto Body Works on South Arroyo Parkway, was working across the street when it happened. He told the Los Angeles Times the neighborhood was "pretty busy" and that several people witnessed it. Cruz parked his car in a Petco parking lot, walked to the sidewalk, and pulled out the gun. Amini saw the man lying face down afterward. Police arrived about "five seconds" later, he said. "It was really fast."

Pasadena city spokesperson Lisa Derderian confirmed Cruz was found with a self-inflicted gunshot wound. The Sheriff's Department said he shot himself as Pasadena police officers were preparing to contact him.

Both outlets covered the basic facts straight. The New York Post led with the suspect's suicide attempt in its headline; the Los Angeles Times kept the focus on the girl's killing first. Neither outlet pressed on the questions that matter most to ordinary Americans: Was Cruz known to law enforcement before Thursday? Were there prior complaints? Does Los Angeles County's approach to domestic violence and offender monitoring give families like this one any real protection before the body count comes in?

Anyone with information is urged to call the Sheriff's Homicide Bureau at 323-890-5500. Anonymous tips can go to Crime Stoppers at 800-222-8477 or lacrimestoppers.org.

A girl is dead. A suspect is in critical condition. And the public is left asking — again — what went wrong before the trigger was ever pulled.