A 16-year-old carriage horse named Deniz paused during a evening ride near East 90th Street on June 9, 2026, to nibble on a green shrub by the curb. Within minutes, the horse collapsed and died right in front of two horrified passengers and dozens of onlookers.
The immediate reaction followed a predictable script. Animal rights activists took to social media to blast the carriage industry, blaming exhaustion, heat, and systemic abuse. Politicians jumped on the tragedy to demand an outright ban on the historic trade. But when the preliminary necropsy results from Cornell University’s College of Veterinary Medicine came back on June 16, 2026, the narrative completely flipped.
Deniz didn't die from overwork. He was poisoned by a common ornamental shrub planted right inside the park: the Japanese yew.
This revelation shifts the conversation from a black-and-white argument about animal labor to a complicated mess of urban management, finger-pointing, and political opportunism. It raises a glaring question that everyone is avoiding: How did a highly toxic plant end up exactly where working animals are forced to navigate?
The Poison in the Park
The Cornell necropsy confirmed that Deniz ingested a substantial amount of Japanese yew (Taxus cuspisata). To the untrained eye, it's just a lush, evergreen bush with bright red berries often used for landscaping. To a horse, it's an incredibly swift killer.
Every single part of the Japanese yew, except for the fleshy red part of the berry, contains taxine alkaloids. These chemicals are exceptionally dangerous because they directly target the heart muscle. Once a horse eats the leaves or twigs, the taxine quickly disrupts the cellular channels that regulate heartbeats.
The breakdown of how the toxin works is brutally efficient:
- Rapid Absorption: The digestive system absorbs the taxine alkaloids almost immediately.
- Cardiac Arrest: The toxin blocks sodium and calcium channels in the heart, slowing the heart rate down drastically until it simply stops beating.
- No Warning: Horses can't vomit, meaning once the plant is swallowed, there's no natural way for the animal to purge the poison.
Death usually happens within hours, sometimes even minutes, of ingestion. A mere half-pound of yew leaves can kill a full-grown, 1,000-pound horse. Deniz didn't stand a chance.
A Battle of Negligence and Finger-Pointing
The necropsy report has triggered an all-out war between the Transport Workers Union (TWU) — which represents the carriage drivers — and the Central Park Conservancy, the private non-profit that manages the park.
The TWU is using the report to clear the horse's owner, Nurettin Kirbiyik, of any wrongdoing. They've pointed out that Deniz passed a rigorous physical exam by the NYPD’s Mounted Unit veterinarian back in March. Kirbiyik, who owned the horse for a decade, stated he bathed and groomed Deniz daily and considered him family. The union is aggressively deflecting blame away from industry practices and pinning it squarely on park management.
"Poor Deniz died because the people running the Park Conservancy never warned anyone that there were deadly yew plants in the park," said Alexander Kemp, TWU’s administrative vice president, in a blistering statement. The union calls it negligence at the highest level.
But the situation isn't that simple. Park rules explicitly forbid drivers from letting their horses forage or eat the park’s flora. Critics argue that a seasoned driver should never allow a horse to graze on random city bushes, especially in an urban environment where ornamental plants are common.
The Broader Push to End the Carriage Trade
Even though the toxicology report proved the death wasn't caused by heatstroke or physical exhaustion, it has done absolutely nothing to slow down the political momentum to ban horse-drawn carriages in New York City. If anything, it's fueled the fire.
Activists like NYCLASS and Voters for Animal Rights argue that the poisoning itself proves that a chaotic city park is no place for a large herbivore. They argue that you can't realistically keep an animal safe from urban hazards when it's walking through crowded, unpredictable streets.
The Central Park Conservancy has also doubled down on its stance against the trade, though they cite public safety rather than plant management. According to the Conservancy, New York has seen at least seven major horse-related incidents over the last 13 months alone.
Consider the chaotic timeline leading up to this point:
- May 18, 2025: Two carriages collided at the 7th Avenue hack line, overturning a carriage and sending a driver to the hospital.
- May 26, 2025: Two horses bolted through the East Drive, injuring both operators who tried to stop them.
- September 4, 2025: Tourists had to leap from a speeding carriage after the horse got spooked and bolted down East Drive, smashing into metal signs.
- January 8, 2026: A horse named Destiny ran into oncoming traffic on West 59th Street, crashing into four cars and tearing the bumper off a taxi.
- May 19, 2026: A spooked horse tipped a carriage over near Seventh Avenue, leaving a driver in a neck brace.
With Mayor Zohran Mamdani explicitly backing a ban and Council Member Chris Marte introducing "Ryder’s Law" to phase out the carriages entirely, the industry is facing its most perilous political moment in decades.
The Real Fix for Working Animals in Cities
Banning the industry or completely ripping out every ornamental bush in Manhattan are both extreme, slow-moving reactions. If the goal is actually protecting these animals right now, the city needs to move past political theater and enforce practical safety measures.
First, the Central Park Conservancy needs to audit and map every single toxic plant species within reaching distance of the park drives. If Japanese yew, oleander, or foxglove are planted near the curbs, they need to be replaced with safe, native alternatives immediately.
Second, carriage drivers need mandatory, certified training on urban plant identification. Relying on a blanket rule that says "don't let them eat the plants" clearly failed. Drivers must know exactly what a toxic shrub looks like so they can actively pull their horses away before a tragedy happens.
Finally, the city needs clear signage and physical barriers around pedestrian-heavy zones to keep horses strictly on the designated paths, away from ornamental landscaping.
Deniz's death was a freak accident born from a lack of oversight, but using it as a political football doesn't save the remaining horses. Better education, smarter landscaping, and strict accountability will.
