SACRAMENTO, Calif. — A 31-year-old inmate already serving life without parole for a prison murder has now been implicated in a third killing inside the same maximum-security facility, a two-week span of violence that has left corrections officials and criminal justice experts grappling with how one man could methodically turn an eight-year burglary sentence into a death sentence for three people.
Tyler L. Yates, identified by prison records as a Level 4 inmate at New Folsom State Prison in Sacramento, is now at the center of one of the most disturbing sequences of custodial violence in recent California history. The latest incident occurred at 6:13 a.
m. when correctional officers conducting a routine security check found Yates’s cellmate, Jake Kennedy, dead from multiple stab wounds. Staff immediately restrained Yates, who was in the cell at the time, and transported Kennedy to the institution’s medical unit, where he was pronounced dead.
The killing of Kennedy came less than two weeks after Yates and Kennedy allegedly acted together in the fatal stabbing of another inmate on the prison’s main exercise yard.
That earlier attack, which occurred at 1:21 p. m. on the yard, left 39-year-old Jonathan RDE dead despite emergency medical personnel administering life-saving measures at the prison’s triage and treatment area.
A paramedic pronounced RDE dead approximately twenty minutes later. RDE was serving a four-year sentence for vehicle theft. Yates, who was 30 at the time, and Kennedy, who was serving six years for carrying a knife and had been sentenced to an additional four years over another prison stabbing, were identified as the assailants.
Now, with Kennedy dead, the body count attributed to Yates has reached three within a three-year period, all inside the same facility.
The timeline of Yates’s descent is as stark as it is baffling. He first arrived at New Folsom in 2017, transferred from San Diego County after being sentenced to eight years for first-degree burglary and assault likely to cause great bodily injury. He was 23 years old.
For the first five years of his incarceration, he remained largely unremarkable within the general population, his face bearing the tattoos of his San Diego origins, including the prominent “SD” inked across his cheek. In 2022, however, that changed. Yates and another inmate, Gregory Roach, were suspected in the death of Nathan Marcus, a 33-year-old inmate, on March 22 of that year.
The killing was investigated as a homicide, and both men were moved to a segregation unit during the probe. In 2024, a Sacramento County jury convicted Yates of first-degree murder for stabbing Marcus to death, sentencing him to life without the possibility of parole as a second striker.
What makes the case so confounding to prison observers is the timing. Yates was sentenced to eight years in 2017. With standard good-time credits in California, he was roughly three years away from release when he committed the first murder.
He had no incentive to throw away his freedom, yet he did. By 2024, he had been convicted and sentenced to life without parole. He had nothing left to lose.
That, experts say, is precisely when he became exponentially more dangerous. The second murder, the killing of RDE, occurred after he was already sentenced to life. The third, the killing of his own alleged accomplice Kennedy, occurred just two weeks later.
“This is a case study in the absolute finality of a life sentence without parole,” said a former California Department of Corrections and Rehabilitation official who spoke on condition of anonymity due to the sensitivity of the ongoing investigations. “Once you have a life without parole, you are not going home. You are not getting out.
For some inmates, that creates a kind of nihilistic calculus where they no longer fear any additional punishment. What are you going to do, give them another life sentence? They already have one.
The system has no deterrent left for them.”
The official’s assessment is echoed by the stark reality of the prison’s layout. New Folsom, a Level 4 facility, is designed for the state’s most violent offenders. The yard is a barren expanse of sand and sky, surrounded by high walls that obscure any view of the outside world.
Inmates cannot see grass, only the distant mountains. The red tape and the presence of detectives on the yard after a killing are common sights. It is a world where violence is not just possible but expected, a social order governed by a brutal code of conduct that often forces inmates into acts of aggression they did not plan.
The first murder, the 2022 killing of Marcus, was allegedly a coordinated attack. Yates and Roach were both moved to segregation during the investigation. Roach’s role in that killing remains unclear, but the fact that Yates was convicted and sentenced to life for it suggests he was the primary actor.
The second murder, the killing of RDE, was allegedly a joint operation with Kennedy. The two men attacked RDE in broad daylight on the main exercise yard, in front of other inmates and under the watch of correctional officers. The brazenness of the attack suggests either a complete disregard for consequences or a belief that the prison’s informal power structure would protect them.
Then came the third murder. Less than two weeks after the attack on RDE, Yates turned on Kennedy. The motive is unknown, but speculation among inmates and former corrections staff centers on the possibility that Yates believed Kennedy might cooperate with investigators, or that Kennedy had violated some unspoken code of conduct during the RDE killing.
In the hyper-violent world of California’s prison politics, where loyalty is paramount and betrayal is punishable by death, the killing of a co-conspirator is not unheard of. It is a chilling reminder that in this environment, alliances are temporary and survival is the only constant.
The fact that all three murders occurred at the same facility has raised serious questions about the California Department of Corrections and Rehabilitation’s handling of Yates. After the first murder in 2022, he was moved to a segregation unit, but he was eventually returned to the general population. After his conviction and life sentence in 2024, he was again placed in the general population, where he was housed with Kennedy.
The decision to place a known murderer, one already serving life without parole, in a cell with another inmate has been met with disbelief by those familiar with the case. In many other states, such an inmate would be placed on single-cell status indefinitely, isolated from the general population to prevent further violence. In California, at New Folsom, that did not happen.
“They usually put them on single cell status after the first murder,” one Reddit user posted in a thread about Yates, reflecting a broader sentiment of incredulity. “I don’t understand why they would allow him to have a cellmate after the first imprison murder he committed.” The user’s comment highlights a systemic failure that may have cost two more lives.
After the second murder, Yates was again placed in a cell, this time with Kennedy, the man he would eventually kill. The pattern is clear: Yates was given access to victims, and he used that access with devastating efficiency.
The victims themselves are a study in the randomness of prison violence. RDE, the second victim, was serving four years for vehicle theft. He was 39 years old.
He had no history of violence in prison, according to available records. He was simply in the wrong place at the wrong time. Kennedy, the third victim, was a convicted felon with a history of violence, including a prior prison stabbing that added four years to his six-year sentence for carrying a knife.
He was not an innocent. But he was, at the moment of his death, Yates’s cellmate and alleged co-conspirator. The fact that Yates killed him suggests a level of ruthlessness that transcends even the brutal norms of prison life.
Yates is now 31 years old. He has been in prison since 2017. He has been convicted of one murder and is the prime suspect in two others.
He is already serving life without parole, so any additional convictions will have no practical effect on his sentence. He will never leave prison. He will die there.
The only question is how many more people he will kill before that happens. The answer, according to those who study prison violence, depends entirely on how the state chooses to house him going forward. If he is returned to the general population, the risk of a fourth killing is not just possible but probable.
If he is placed in permanent administrative segregation, or what inmates call “the hole,” he will be isolated from potential victims.
“He’s already got a three kill streak on his fellow inmates,” the Reddit user continued. “It’s got to be enough inmate blood on his hands at this point. He’s definitely going to try aiming for a more valuable target and spice the next one up a notch.”
The user’s warning is not hyperbolic. Inmates serving life without parole who have already killed multiple people have a documented history of escalating their violence, often targeting correctional officers or other staff members. The rationale is simple: they have nothing to lose, and killing a guard is a way to assert power, to make a statement, or simply to pass the time.
The California Department of Corrections and Rehabilitation must now decide whether Yates is a threat that requires permanent isolation or a problem that can be managed within the general population. The stakes could not be higher.
The broader implications of this case extend beyond the walls of New Folsom. It raises fundamental questions about the purpose of incarceration. Yates was sentenced to eight years for burglary and assault.
He was not a hardened killer when he entered prison. He was a young man who had made a mistake, a serious mistake, but one that did not warrant a life sentence. In prison, however, he was transformed.
The environment, the politics, the constant threat of violence, the pressure to prove oneself, all of it conspired to turn him into something he may not have been before. He followed the rules of the prison, not the rules of society. And the rules of the prison demanded violence.
“You don’t follow the rules to end up in there,” said the former corrections official. “But to survive in there, you have to follow the rules. That’s what he did.
He followed the rules. California State Prison, you got to be ready to go. And when you get picked, hey, it’s your turn.
Here’s the knife. You got to do exactly what he did.” The official’s words are a chilling indictment of the prison system itself.
Yates is not a monster who emerged from a vacuum. He is a product of an environment that rewards violence and punishes weakness. He turned eight years into a life sentence, but the system that housed him, that failed to isolate him after his first murder, that allowed him access to a cellmate after his second, is complicit in the deaths that followed.
The investigation into the third murder is ongoing. The Sacramento County Coroner’s Office will determine the official cause of death for Kennedy. The California Department of Corrections and Rehabilitation has placed Yates in a segregation unit pending the outcome of the investigation.
It is unclear whether he will face criminal charges for the second and third murders, though it is likely he will. The Sacramento County District Attorney’s Office has already secured one conviction against him. They will likely seek more.
But the practical effect of any additional convictions is nil. Yates is already serving life without parole. He is already condemned to die in prison.
The only thing that remains to be determined is how he will spend the rest of his life, and whether he will be given the opportunity to kill again.
For the families of the victims, the pain is immeasurable. Nathan Marcus, the first victim, was 33 years old. Jonathan RDE, the second, was 39.
Jake Kennedy, the third, was a convicted felon, but he was still someone’s son, someone’s brother, someone’s friend. They all died at the hands of a man who was supposed to be under the supervision of the state. They all died inside a facility that was supposed to keep them safe.
The state failed them. The system failed them. And now, a 31-year-old man with a three-kill streak is sitting in a segregation cell, waiting to see what happens next.
The only certainty is that Tyler Yates will never be free again. The only question is how many more lives will be lost before the state figures out how to contain him.
