Ginger Welch, one of the leading jockeys at Les Bois Park, died after she was thrown by her horse, which then fell on her, during a race Saturday night. She was 37. According to the Associated Press, Welch's mount, 4-year-old gelding, Porthos either took a bad step or clipped heels with another horse and fell shortly after the start of an 870-yard Quarter Horse race. "She was right beside me, then her horse fell," another jockey, Cammie Papineau, told the AP. "There was nothing she could have done."Welch was treated by medics at the track then taken to Saint Alphonsus Regional Medical Center, where she died. Her death was the first in the track's 30-year history. Born Ginger Tremain on Jan. 15, 1963, in Henderson, Nev., Welch began her career at tracks in Pennsylvania and New Jersey tracks, learning the trade from top female jockey Julie Krone.Welch then returned to Idaho and Washington, with one of her victories coming in the 1990 Centennial Cup, Idaho's first $100,000 race.Dr. Don Roloff, the track veterinarian, said Porthos sustained a pulled muscle and scraped shoulder.