Deep Impact at Shadai Stallion Station, Hokkaido last yearImage: Getty
In 2019, Deep Impact was sitting atop of the flat-racing rankings for sires for an eighth year in succession.
He sired five Japanese Derby winners, as well as two Japan Cup victors.
One of the Cup winners, Gentildonna, became the first horse to win the race twice when going back-to-back in 2013 and the mare was also named Japanese Horse Of The Year on two occasions.
Deep Impact has sired 40 Group One-winning horses - according to the Japan Bloodstock Information System - including 2017 Emirates Stakes winner Tosen Stardom.
In his own racing career, Deep Impact was a superstar of the track - winning 12 of his 14 starts, including seven Group Ones.
A tweet from Keiba Lab - the official account of Horse Racing Lab - revealed Deep Impact was "unable to stand" on Monday, and X-rays on Tuesday revealed a "cervical fracture" from which he could not recover.
It was only earlier in July that Deep Impact produced a whopping sale-topper at the JRHA Select Sale, the colt out of Musical Way going for an estimated AUD$4.75 million.
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