Supporters of a carriage horse named Lady that collapsed and died in Hell's Kitchen held a rally across the from the stable where she lived.

The death of the 15-year-old mare named Lady was being investigated by the city’s health department, officials said.

Lady, a 15-year-old horse that had just been brought to New York City from Pennsylvania in June, suffered an aortic rupture likely caused by a small tumor in her adrenal gland, the union said.