Jonaiki Martinez-Estrella dead: Gang member who killed Lesandro 'Junior' Guzman-Feliz' dies at Coxsackie Correctional Facility

A confirmed gang member, found guilty of inflicting the deadly stab wound in the high-profile 2018 killing of 15-year-old Lesandro “Junior” Guzman-Feliz, has passed away in a New York state prison.

The New York State Department of Corrections and Community Supervision’s website reported that Jonaiki Martinez-Estrella, aged 31, was discovered deceased at the Coxsackie Correctional Facility. The specific cause of death has yet to be determined.

In May, a Bronx Supreme Court Justice re-sentenced Martinez-Estrella to serve 25 years to life due to his role in Guzman-Feliz’s murder. Earlier, in March 2023, the Court of Appeals had reversed his first-degree murder conviction, which had resulted in a life sentence without parole eligibility. Nonetheless, Martinez-Estrella’s convictions for second-degree murder, conspiracy, and gang assault remained intact.

Thirteen other defendants who had a role in the deadly 2018 attack are being held accountable for their actions and remain in prison serving their respective sentences, Bronx District Attorney Darcel D. Clark said.

On June 20, 2018, Lesandro “Junior” Guzman-Feliz was mistakenly targeted as a rival gang member by a group of 14 men, all believed to be members of the Trinitarios gang.

Authorities were called for reports of an assault in progress around 11:40 p.m. that day, at a bodega on East 183rd and Bathgate Avenue in the Bronx. When they arrived, witnesses told them there had been a fight in front of the store that resulted in the 15-year-old getting slashed in the neck with a machete.

Officials say Junior then ran to St. Barnabas Hospital, located just a block away, but he collapsed on the sidewalk. His dying words, investigators said, were that he needed some water.

Jonaiki Martinez-Estrella, Gang Member Convicted in the Killing of Lesandro 'Junior' Guzman-Feliz, Found Dead at Coxsackie Correctional Facility

He lived one block from the bodega and was known in the neighborhood as Junior. Investigators say he told his mother he was heading downstairs to repay $5 to a friend, but instead he ended up involved in some type of dispute.

Relatives hugged and cried at the scene the day after the slashing, desperate to understand how and why such a thing could happen. They described him as a typical teenager.

“All I can say was that he was a good kid,” sister Genesis Collado-Feliz said. “He just played PlayStation. He played Fortnite. He played 2K, like every 15-year-old. He asked me for advice with girls.”

The stabbing of Junior stunned the city with its sickening depravity, and launched an international social media movement under the hashtag #justiceforjunior that sought justice for the teen.

Emotional vigils have been held in the years following the boy’s death.

Last November, members of the NYPD released balloons to honor Junior six years after the deadly attack. Guzman was a member of the NYPD’s Explorer Program.

The NYPD released balloons in honor of murder victim Junior Guzman.

In 2019, Junior’s mother, Leandra Guzman, laid flowers down at the spot where her son begged for his life. Standing there, she said, just made her think about how much he suffered.

“I feel the same day, it’s nothing passing for me,” she said. “I don’t feel like any years gone on. I don’t feel that. I feel like I’m in the first day,” she said in 2019.

Justice would eventually come, but as then-NYPD Chief of Detectives Dermot Shea said four years ago, “I don’t think the family will ever recover in a case like this. It never ends for victims.”

Five gang members were convicted. One man sentenced to life in prison without parole and the other four serve 20-plus years to life.

Martinez-Estrella, who delivered the fatal blow by stabbing Junior in the neck, was initially sentenced to life in prison without parole.

Prosecutors said that he was not remorseful and that, in fact, a correction officer found him with a one-inch sharp object in his shoe on the way to court that morning.

In court, he told the judge, “I’m sorry” and “My intention was not to cause death,” blaming drugs, alcohol, and allegiance to the Trinitarios gang.

Antonio Rodriguez Hernandez Santiago, Jose Muniz, and Elvin Garcia were all sentenced to 25 years to life, while Manuel Rivera was sentenced to 23 years to life because of his age at the time of the crime.

Junior’s parents delivered powerful impact statements to the men who took away their pride and joy.

“They killed an innocent child,” Junior’s mother said. “Of all these men, not a single one of them said, ‘No, no, don’t do it.’ That night, there were two deaths, Junior and I, who was left dead inside. As a young boy, my son dreamed of becoming a detective, so he could protect this city…Please make sure my son’s dreams come true. These killers should never be able to step out of a jail cell, so they know the moment they killed my son, they took their own lives as well.”

Junior’s mom has since lobbied for putting panic buttons in bodegas. A free camp was also opened up in after Junior’s murder in his honor.

———-

* Get Eyewitness News Delivered

* More Manhattan news

* Send us a news tip

* Download the abc7NY app for breaking news alerts

* Follow us on YouTube


Submit a tip or story idea to Eyewitness News

Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.

Copyright © 2025 WABC-TV. All Rights Reserved.

You May Also Like

Georgia teen arrested after allegedly dropping plastic tub containing dismembered torso

Georgia Teen Arrested After Allegedly Discarding Plastic Tub Containing Dismembered Torso

An 18-year-old was allegedly seen abandoning a plastic container holding a dismembered…
Masked Massachusetts mob attacks McDonald’s worker behind counter during teen takeover; 4 arrested

Four Arrested After Teen Mob Attacks McDonald’s Worker in Massachusetts

A group of masked Massachusetts teenagers rushed into a McDonald’s and attacked…
Iranian president blames US for Middle East conflict while denying nuclear ambitions, offers to dilute uranium

Iranian President Blames US for Middle East Conflict, Denies Nuclear Ambitions and Offers to Dilute Uranium

Iranian President Masoud Pezeshkian said Thursday that Tehran has no interest in…
Pope Leo XIV begins historic 4-day visit to France

Pope Leo XIV Begins Landmark Four-Day Visit to France

Pope Leo lands in France for four-day visit Pope Leo arrived in…
Pittsburgh doctor stabbed to death after intruder allegedly attacks him, wife as they slept: police

Pittsburgh Doctor Fatally Stabbed in Alleged Home Invasion Attack, Police Say

A doctor at a Pittsburgh children’s hospital was fatally stabbed and his…
Alleged peeping tom caught hiding in ceiling of college women's soccer locker room

Alleged Peeping Tom Found Hiding in College Women’s Soccer Locker Room

An Ohio man was arrested after allegedly hiding in the ceiling above…
Mistress told ‘American Idol’ contestant she wanted ‘to kill’ wife but testified divorce, not murder, was plan

American Idol Contestant’s Mistress Says Divorce, Not Murder, Was Plan

Jurors spent hours Thursday reviewing a large volume of messages exchanged between…
NYC Council takes aim at AI companies with new bills mandating 'kill switches,' offering cash for whistleblowers

NYC Council Proposes AI Kill-Switch Bills, Whistleblower Rewards

New York City lawmakers are moving to regulate artificial intelligence, unveiling a…
'American Idol' alum Caleb Flynn's cringey love songs for mistress played at his murder trial -- as victim's relatives hold back laughter

American Idol Alum Caleb Flynn’s Love Songs to Mistress at Murder Trial

Now he is being forced to confront the consequences. Former “American Idol”…
Cook County sheriff's investigators at Ford Heights Municipal Hall in Illinois; Mayor Freddie Wilson at scene

Cook County Sheriff’s Investigators at Ford Heights Hall; Mayor Wilson

FORD HEIGHTS, Ill. () — Cook County sheriff’s investigators searched Ford Heights…
Corie Walsh’s husband faces alleged killer mom accused of plotting to poison him as attorney lays blame

Corie Walsh’s Husband Faces Mom Accused in Alleged Poison Plot

Corie Walsh, 40, the Illinois mother charged in the death of her…
Unbeaten LI football powerhouses prepare for first-ever battle — and Kash Patel loves it

Unbeaten Long Island Football Powerhouses Set for First-Ever Showdown as FBI Director Kash Patel Cheers On

Neither the Garden City Trojans nor the Massapequa Chiefs has lost a…