A Brooklyn jogger was stabbed to death on a public bike path by a suspect who stripped to his underwear and hurled blood-soaked evidence down a garbage chute — a man discharged from the Marines for failing a psychological evaluation who was nonetheless free to walk the streets, and even return to work with children after the killing.

Sayed Mohassib, 27, was charged with second-degree murder and criminal possession of a weapon after NYPD detectives tracked him down, according to AM New York. Court documents show surveillance captured Mohassib walking into the Belt Parkway bike path area on Oct. 30. Katherine Suarez, 28, had called her father at 7:56 p.m. Minutes later, she was stabbed twice in the neck. Her father found her body under a tree after she didn't return from her run.

NYPD Chief of Detectives Joseph Kenny described the aftermath: "What we see at the location is a blood trail, a heavy amount of blood. They call it arterial spurting, where the attack happens. Katie is strong enough; she's able to run about 150 feet eastbound on the path where she finally collapses underneath a tree. The wounds are from an upward trajectory going through her neck, hitting a vein, and it actually entered into her oral cavity."

Mohassib told detectives he was "compelled" to walk to the area holding a knife or his family would be killed. He claimed he woke up covered in blood but didn't stab anyone — then rushed home, ditched the knife and clothing, and was caught on camera leaving his apartment in only underwear, throwing items down a garbage chute. Investigators found a "reddish stain" on his apartment wall that tested positive for blood.

Here's what the system knew about Mohassib before Suarez died: He was discharged from the Marines for failing a psychological evaluation. He worked briefly in the NYPD field training unit for one month in 2022 before leaving. And after the murder, he simply went back to work at PS 200, The Benson School — working with children. Every red flag. No intervention.

Meanwhile, in California, the same system that couldn't stop a killer before he struck may have locked up the wrong man for nearly 40 years. Kenneth Clair, convicted of the 1984 murder of Santa Ana nanny Linda Faye Rodgers, is seeking a new trial based on DNA evidence that found no trace of his genetic material on or around the victim's body, the Orange County Register reported.

Instead, DNA from an unknown male and an unknown female turned up on the shirt used to strangle Rodgers, the chrome bar used to strike her, a glove near the body, the fly of Rodgers' jeans, and a cigarette butt on the waterbed where the killing occurred. A child witness told police the attacker was White. Clair is Black. No fingerprints, no hair, no physical evidence ever tied him to the scene.

Clair was homeless, living in an abandoned house next door, arrested days earlier for burglary and released hours before the killing. He spent years on death row before an appellate court overturned the sentence. He's now serving life without parole.

"This new evidence, in combination with the evidentiary record, exonerates Mr. Clair completely. It proves, unequivocally, that Mr. Clair is actually innocent of the murder of Linda Rodgers," defense attorney Michael Mortenson said in the motion for a new trial.

The Orange County DA's office didn't respond to requests for comment. Prosecutors have maintained that blood scrapings on a knife found in the home are genetically consistent with Clair as a source.

Two cases. One system. A jogger dead because every warning sign was ignored, and a man who may have spent his entire adult life in a cell for someone else's crime. The question isn't whether the system is broken. It's who keeps paying the price — and it's never the people running it.