The horse, named Lady, crumpled to the ground in Hell's Kitchen after she had only done two rides Tuesday afternoon — stoking renewed outrage from animal rights activists.

The cause of death of a carriage horse that collapsed and died in Hell's Kitchen Tuesday has been determined, the union representing carriage horse operators said Friday.  Lady, a 15-year-old horse that had just been brought to New York City from Pennsylvania in June,

On Tuesday, a carriage horse in Manhattan collapsed and died on the way to its stable, according to a local union. Authorities learned of the incident around 2:30 p.m. after receiving a 911 call requesting assistance at the corner of West 51st Street and 11th Avenue in midtown.