A Storm Cat colt that sold for $900,000 as a yearling collapsed and died Sunday after working an eighth of a mile at Calder Race Course during the first under tack show for the Fasig-Tipton Florida select sale of 2-year-olds in training. The cause of death was not immediately known, but there was “no apparent injury to the limbs,” said Boyd Browning, Fasig-Tipton’s executive vice president and chief operating officer. “My highly uneducated guess is that it was probably a heart attack.”

Browning said the colt would be sent to Gainesville, Fla., to be autopsied. (For information on cardiac causes of sudden death in horses see www.TheHorse.com/ViewArticle.aspx?ID=5331.)

Florida-based Pinhookers Randy Hartley and Dean De Renzo were the colt’s consignors. They purchased him last August from Paramount Sales, agent, at the Fasig-Tipton Saratoga select yearling auction. Produced from the 9-year-old unraced Gone West mare Gone to the Moon, the colt is from the family of champion sprinter Gold Beauty, whose offspring included English Horse of the Year and French champion Dayjur and grade I winner and grade I producer Maplejinsky.

Eagle Holdings bred the colt in Kentucky