THE tragic death of 26-year-old jockey Simone Montgomerie in Darwin last year following a race fall from the horse Riahgrand was caused by no single factor,  according to a Northern Territory WorkSafe investigation report released on Friday.

PATRICK BARTLEY reports in THE AGE that the death of the likeable young jockey stunned the racing world last August when she fell from her horse during the running of the Lightning Plate at the Darwin Cup day fixture.

"This was a very public, very tragic event," Work Health Authority deputy chief executive Doug Phillips said.