Bruce Keesling said that a preliminary autopsy report revealed no signs of trauma on the body. Divers working for the South Florida Water Management District found the vehicle Monday during a routine search of the canal for cars. Keesling said Tammaro's medical problems might have played a part in his death, and that suicide has not been ruled out. Tammaro underwent liver surgery three weeks before his disappearance. He had told family members he had not been feeling well.
Police have no witnesses who saw the car enter the canal.
The final autopsy report has not been released. Tammaro was last seen when he drove off from the stables at Gulfstream Park in Hallandale, less than 10 miles from Miramar. Pletcher, who saddled four starters in his Kentucky Derby debut last year, also won last year's Arkansas Derby with Graeme Hall. Jamaican Rum, trained by James Cassidy, is coming off a third-place finish to Point Given in the San Felipe at Santa Anita on March 17. In the San Vicente on Feb. 3, he was fourth behind Early Flyer.