The death partly overshadowed the first Melbourne Cup win by Godolphin on Wednesday morning with many people concerned about the death of a fifth horse in a Melbourne Cup-related incident in the past six years. During the past year 119 were pronounced dead on Australian tracks between August 2017 and July 2017 - that's one animal every three days.
A report prepared by the Coalition for the Protection of Racehorses showed 56 out of the 119 deaths last racing year were caused by front limb injuries.
Racing Victoria will collect the horse's medical records and obtain The Cliffsofmoher's exercise records in consultation with the stable.
"It is with sadness that we confirm that The Cliffsofmoher had to be humanely euthanised after sustaining a fractured right shoulder", racetrack executive general manager Jamie Stier said.
The Cliffsofmoher was an Irish horse ridden by English jockey Ryan Moore.
French-trained horse Verema had to be put down after an injury suffered in the 2013 Cup.
Araldo placed seventh but was spooked by a flag in the crowd on the way back to weigh in, kicking out and breaking a rear leg on a fence.
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In a statement, RSPCA Australia spokesperson Jane Speechley said: "Our thoughts are with animal lovers across the country who have been affected by this loss, and confronted by the very real risks posed by racing to the horses involved".
Racing.com's Shane Anderson first shared the news on Twitter, writing: "Horrible news".
Veterinarians rushed on to the track as soon as the race was completed as a tarp was erected around the fallen stayer.
Seven commentator Bruce McAvaney described it as a "tragedy".
It came after he was spotted looking very agitated moments before the start.
Ryan Moore attempts to stop The Cliffsofmoher after it injured its shoulder early in the Melbourne Cup. "He's really sweating up badly".
The Charlie Appleby-trained gelding stormed down the straight from the outside to haul in runner-up and last year's favourite Marmelo, with A Prince of Arran coming third in the A$7.3 million (nearly $NZ8 million) handicap at Flemington racecourse.