YOUNG jockey Caitlin Forrest has died after a shocking four-horse fall at Murray Bridge on Wednesday.

Forrest, 19, died from injuries suffered in the horrific incident when she was flung into the turf and run over by the pack in the race before the Murray Bridge Gold Cup.

The South Australian apprentice was semi-conscious, breathing on her own and responsive when air-lifted to Royal Adelaide Hospital but her conditioned worsened and she passed away late on Wednesday night.

media_camera The aftermath of the fall. Picture: Sam Wundke.

Forrest was riding the early leader Collo Voce when the sprinter broke his leg and knuckled on the turn, sending her into the turf and leaving the following jockeys and horses nowhere to go.

Three horses and riders – El Prado Gold (Adrian Patterson), Ethbaal (Justin Potter) and Barigan Boy (Libby Hopwood) – went down in the wake.

Patterson and Potter were able to escape without any serious injury while Hopwood was taken to Flinders Hospital with a suspected broken collarbone and was being treated for concussion.

media_camera The horrific mass fall. Picture: Sam Wundke.

The horse Forrest was riding, Collo Voce, was put down, but the other three who went over got up and kept running.

The South Australian racing industry is in mourning after the loss of such a popular young rider.

Her boyfriend, fellow jockey Scott Westover, left a tribute on Facebook.

“Today has been the worst day of my life,” Westover wrote.

media_camera Murray Bridge races. Picture: Sam Wundke.

“I know there will be an angel up there watching me everyday and riding with me.

“Love you and I’ll never forget you.”

Patterson, who’s horse, El Prado Gold, went through the running rail in the fall, tweeted out:

“Without a doubt the worst day on a racecourse. My heart goes out to Scott & Caitlin’s families words can’t describe sorry RIP”.

Forrest is the second jockey to die on Australian soil this week after the tragic passing of Queensland hoop Carly-Mae Pye on Tuesday.