Rony Yahir Alvarenga Rivera Charged in Fatal Island Park, Valley Stream Stabbings

Nassau police say Rony Yahir Alvarenga Rivera is accused in two fatal stabbings hours apart in Island Park and Valley Stream, including one at a Wendy's on Austin Boulevard.

Updated May 3, 2026
CRITICAL INCIDENT
Town
Valley Stream
County
nassau County
Reported
Source
News12
Rony Yahir Alvarenga Rivera Charged in Fatal Island Park, Valley Stream Stabbings

Suspect Identified in Two Nassau County Fatal Stabbings

Nassau County police have identified Rony Yahir Alvarenga Rivera, 22, as the suspect accused in two fatal stabbings that happened hours apart in Island Park and Valley Stream, according to News 12 Long Island.

The case has drawn heavy regional attention because police say the two women were killed in separate Nassau County communities within the same overnight period. The first reported scene was a Wendy’s restaurant on Austin Boulevard in Island Park. The second was a residence on Mineola Avenue in Valley Stream.

Police say Alvarenga Rivera is facing multiple murder charges and has pleaded not guilty, News 12 reported.

Island Park Wendy’s Stabbing

According to News 12, police responded to a Wendy’s restaurant on Austin Boulevard in Island Park shortly after midnight Friday. Investigators said a 42-year-old woman, described as Alvarenga Rivera’s coworker, was stabbed and killed while taking out the garbage behind the restaurant.

News 12 reported that investigators said Alvarenga Rivera later called police and told them he had stabbed someone.

Det. Lt. George Darienzo told News 12 that while police were at the scene, they received information that a person had been stopped at 169 Atlantic Avenue in Lynbrook.

“He asked to see police and when police arrived, he said he killed somebody that night,” Darienzo said, according to News 12.

Alvarenga Rivera was arrested outside a 7-Eleven in Lynbrook, News 12 reported.

Valley Stream Investigation

Police said the second fatal stabbing happened on Mineola Avenue in Valley Stream a few hours later, according to News 12. Investigators said a 32-year-old woman had stab wounds to the neck and torso.

News 12 reported that police said Alvarenga Rivera and the Valley Stream victim lived at the same location. Darienzo described the home as a shared living arrangement where occupants rented bedrooms and used common spaces including a living room, kitchen and bathroom.

“So they cohabitate, acquaintances of one another,” Darienzo told News 12. “I’m not aware of a specific domestic relationship between the two.”

The identities of the victims were not included in the News 12 report reviewed by Long Island Traffic.

Earlier Reporting Said One Suspect Was in Custody

Patch reported Friday that Nassau County police said one suspect was in custody after incidents in Island Park and Valley Stream, citing the NCPD Homicide Squad. At that point, Patch reported that police had not yet released the suspect’s identity or detailed charges.

News 12 later identified the suspect as Alvarenga Rivera and reported that police connected him to both fatal stabbings.

Why Long Island Traffic Is Covering This Story

Long Island Traffic primarily covers road safety, crashes, transit disruptions and commuter conditions. This case falls into a broader public-safety category because it affected multiple Nassau County communities, involved a major police homicide investigation, and became one of the most-searched Long Island crime stories of the weekend.

The locations are also high-traffic community corridors. Austin Boulevard is a major Island Park route connecting the Long Beach barrier island area with mainland Nassau County. Valley Stream sits at the Nassau-Queens border and is one of the busiest commuter gateways on western Long Island.

Major police incidents in these areas can affect local traffic patterns, business access, public transit decisions and community safety awareness.

Current Status

As of the latest News 12 report reviewed by Long Island Traffic, Alvarenga Rivera had been charged in connection with the killings and pleaded not guilty. Police statements and court records may add further details as the case proceeds.

All criminal charges are allegations. A defendant is presumed innocent unless and until proven guilty in court.

Long Island Traffic will update this report if Nassau County police or prosecutors release additional public information about the case.


This report is based on public reporting from News 12 Long Island and Patch. For official updates, consult Nassau County Police Department releases and court records.

Topics

Rony Yahir Alvarenga RiveraIsland ParkValley StreamNassau County policefatal stabbingmurder chargesIsland Park stabbingValley Stream stabbingNassau County murder chargesWendy's Island Park stabbingNassau CountyNassau County accident

Frequently Asked Questions

What should I do if I'm in a car accident in Valley Stream?

Call 911 immediately if anyone is injured or if the vehicles can't be moved safely off the roadway. Stay at the scene — leaving the scene of an accident with injuries is a crime under New York Vehicle and Traffic Law §600. Exchange license, registration, and insurance information with every other driver involved. Take photographs of every vehicle, the position of the vehicles before they're moved, all license plates, the road surface, traffic signs, and any visible injuries. Get the names and phone numbers of every witness — police often won't capture bystander witnesses on their own. Seek medical attention within 24 hours even if you feel fine; soft-tissue injuries and concussions can take a day or two to present, and a delayed medical visit weakens an injury claim. NCPD generally responds to accidents on Nassau County roads outside of incorporated villages with their own police forces (e.g., Garden City, Freeport). For state highways (I-495 LIE, Northern State Parkway, Southern State Parkway, Meadowbrook Parkway, Wantagh Parkway), New York State Police Troop L responds.

How long do I have to file a no-fault claim in New York?

Thirty days. New York Insurance Law §5102 requires you to file a Personal Injury Protection (PIP/no-fault) application with the insurer of the vehicle you were in (or, if you were a pedestrian or cyclist, with the insurer of the striking vehicle) within 30 days of the accident. Missing the 30-day deadline can void your no-fault benefits — that's up to $50,000 in medical bills and 80% of lost wages (capped at $2,000/month) per injured person. The form is the NF-2 application; your insurance carrier provides it on request. New York no-fault is a true PIP system: it pays regardless of who caused the crash.

What counts as a "serious injury" under New York law?

Under Insurance Law §5102(d), a "serious injury" is one that meets at least one of these categories: (1) death; (2) dismemberment; (3) significant disfigurement; (4) a fracture; (5) loss of a fetus; (6) permanent loss of use of a body organ, member, function, or system; (7) permanent consequential limitation of use of a body organ or member; (8) significant limitation of use of a body function or system; or (9) a medically determined injury that prevents the injured person from performing substantially all daily activities for at least 90 of the first 180 days following the accident. Only injuries that meet one of these nine categories create the right to sue the at-fault driver for pain and suffering damages — short of that threshold, recovery is limited to no-fault PIP benefits. Disputes over whether an injury meets the threshold are the single most-litigated issue in NY motor-vehicle cases.

How long do I have to sue after a Long Island car accident?

Three years from the date of the accident for personal injury claims under CPLR §214(5). Wrongful death claims have a two-year deadline under EPTL §5-4.1. If a government entity is involved (a county vehicle, a road defect on a state highway, a defective traffic signal, a county bus), you must file a Notice of Claim within 90 days under General Municipal Law §50-e — that's a non-negotiable jurisdictional deadline, and missing it usually bars the claim entirely. Property-damage-only claims have the same three-year clock. The clock starts on the day of the accident, not the day you discover the full extent of an injury.

Can I still recover compensation if I was partly at fault?

Yes. New York is a pure comparative negligence state under CPLR §1411. Even if you were 90% at fault, you can still recover 10% of your damages. (A pending 2026 budget proposal would change this to a 51% bar — meaning a plaintiff who is more than 50% at fault would recover nothing — but that hasn't passed.) Insurance carriers routinely try to inflate the injured driver's percentage of fault to reduce payouts. The percentage assignment is decided by the jury at trial (or negotiated during settlement); it isn't fixed by the police accident report and isn't binding even when the report assigns fault. Reporting practice and the actual legal apportionment are separate questions.

Who can file a wrongful death claim in New York?

Under EPTL §5-4.1, only the personal representative (executor or administrator) of the deceased's estate can bring a wrongful death action — not the deceased's family directly. The estate is opened in Surrogate's Court of the county where the deceased lived. Damages flow to the spouse, children, parents, and other distributees defined under EPTL §4-1.1. Recoverable damages include loss of financial support, loss of parental guidance for surviving children, and conscious pre-death pain and suffering (recovered through a separate "survival action" under EPTL §11-3.2). New York is unusual in NOT allowing surviving family members to recover for their own emotional grief — only economic losses to the estate. The wrongful-death two-year statute of limitations is shorter than the three-year personal-injury statute, so the deadline is critical.

How do I get a copy of the police accident report?

If Nassau County Police Department (NCPD) responded to the scene, the report is filed under an MV-104A form. In New York State, you can request a copy through the DMV at https://dmv.ny.gov/vehicle-safety/get-copy-accident-report (roughly $7 online, $10 by mail) once the responding agency has uploaded it to the state system, which usually takes 5-10 business days. NCPD and SCPD also have their own direct-request processes through the precinct that responded. If you weren't injured but the property damage exceeded $1,000, New York VTL §605 requires you (the driver) to file your own MV-104 report with the DMV within 10 days regardless of whether police responded.

How dangerous is This Road near Valley Stream?

Long Island Traffic tracks every reported incident on this road across both counties — see the road profile page for the multi-year accident count, severity distribution, and the specific intersections that show repeated incident clusters. Suffolk and Nassau county roads with chronic problems are reviewed by their respective DOTs on a multi-year cadence; persistent issues are sometimes addressed with new signal phasing, lane-narrowing treatments, or — in extreme cases — a Vision Zero engineering response. Daily incident updates flow into our live-events feed every fifteen minutes.

Disclaimer: Incident information on this page is compiled from public sources including police reports, traffic agencies, and news outlets. It is provided for informational purposes only and may not reflect the most current status of this incident. Do not rely on this information for legal, insurance, or emergency decisions. For emergencies, call 911.