Summer Squall, sire of Kentucky Derby and Preakness Stakes winner Charismatic, was euthanized Tuesday because of the infirmities of old age.
The 22-year-old stallion was bred by and stood stud at Will and Sarah Farish's Lane's End Farm in Versailles until his retirement in 2004.
Summer Squall "was an important part of one of Lane's End's great families," Farish said.
The son of Storm Bird and the great broodmare Weekend Surprise, he was a half-brother to top sire A.P. Indy, who also stands at Lane's End.
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In addition to Charismatic, Summer Squall sired Breeders' Cup Juvenile Fillies winner Storm Song and Grade I winner Summer Colony.
Summer Squall won the Preakness Stakes for Cot Campbell's Dogwood Stable in 1990 after finishing second to Unbridled in the Kentucky Derby.
El Prado dies of heart attack
Prominent Thoroughbred sire El Prado died Monday of a heart attack at Frank Stronach's Adena Springs in Paris.
The 20-year-old son of Sadler's Wells was 1991 Irish champion 2-year-old male.
He was the sire of 74 stakes winners including 2004 grass champion Kitten's Joy, 2005 Breeders' Cup Mile winner Artie Schiller, and multiple Grade I winners Borrego and Medaglia d'Oro.
His progeny have earned almost $69 million.