
Zac Purton and Admire Ratki leave the track after finishing last during the Emirates Melbourne Cup on Melbourne Cup Day at Flemington Racecourse. Photo by Getty Images
As it rounded the final bend the horse was clearly under pressure and dropped back through the field sharply.
He finished 25 lengths behind the second-last horse.
Chief steward Terry Baily said the seven-year-old collapsed and died when he returned to the tie-up stalls after the race.
Racing Victoria vets will conduct an autopsy.
"It's a shame. We had such a nice, clean-run Melbourne Cup," Bailey said.