The Cliffsofmoher's death follows several other tragic incidents in recent years on Cup day.
UPDATES: THE horse that exited midway through the Melbourne Cup - the Aidan O'Brien-trained The Cliffsofmoher - has been euthanased.
Cross Counter is also a member of a family with which Sheikh Mohammed has been involved through four generations.
But Charlie Appleby insisted the Sheikh had remained patient and unflustered - and that helped lay the foundations for Cross Counter's 2018 win.
For jockey Kerrin McEvoy, it is his third Melbourne Cup, and he becomes the first jockey to complete the Everest-Cup double.
And when he did, the relatively inexperienced Cross Counter rounded up a field of seasoned stayers and ran away from them to win by a length from Marmelo, with A Prince Of Arran in third place.
McEvoy's great triumph was also Cathy's first time seeing him win the Melbourne Cup, which he has managed to achieve on three occasions.
Dr Koukash is very confident his horse Magic Circle will win the Cup and just as determined to celebrate in a way no owner has before.
"I think what most of our team have realised now is what you want is a really quite classy mile-and-a-half, improving horse who have probably just about already stayed a mile and six (furlongs)".
His powerful Godolphin operation first flew the Melbourne Cup flag with by Faithful Son, which finished seventh in 1998.
It was Buick who was in the saddle when Cross Counter finished runner-up in the Great Voltigeur Stakes at York's Ebor festival - a performance that left the gelding at the very bottom of the handicap with just eight stone to carry in the race that stops Australia.
Lat year Regal Monarch was put down after he fell during the final stretch of the race.
After some fallow years, this season has proved to be stellar one for Godolphin, which ended the British Flat racing season as the leading owner, claiming 113 wins, including its first Epsom Derby, and winning £4.5 million in prize money, according to the website of the British Horseracing Authority.
Admire Rakti and Araldo were both killed in the 2014 Melbourne Cup.
Jamie Stier, Racing Victoria's manager of integrity services, confirmed the news on Tuesday afternoon.
"We were confident we had the right horse coming in".
Ahead of the race, Aidan O'Brien-trained Yucatan, owned by six-time Melbourne Cup victor Lloyd Williams, was strong favorite but the sodden conditions threw the form book out the window.
The Newmarket-based Appleby, who gave Godolphin its first Epsom Derby victor, Masar, in June, added: "This is huge for everybody".
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