What started out as one of racing's best feel-good stories in years ended in tragedy Wednesday at Oaklawn when the fleet Iowa-bred Tyler's Tribe (Sharp Azteca) died following a four-furlong workout. Afterward, the track issued a press release in which it said that trainer Tim Martin's entries for the final week of racing at Oaklawn were being scratched by the stewards. "In the interest of all parties, Oaklawn must take these actions to properly investigate the matter," the statement read. It also said that there would be an investigation regarding...