THE sudden death of Brisbane's premiership winning jockey Stathi Katsidis has been referred to the state coroner.

Katsidis was found dead at his home at Hendra, in the heart of Brisbane's racing district, on October 19 last year.

He had been drinking with friends the night before and fallen asleep on the lounge room couch where his finacee Melissa Jackson found him dead the next morning.

Preliminary police investigations found there was no suggestion of suicide or foul play.

Under the Coroner's Act, the state coroner can investigate unusual deaths and then decide whether a full inquest is necessary.

A spokesperson for the State Coroner's Office confirmed Katsidis's death had been the referred to them but no decision had been made on an inquest.

A decision was unlikely until later this year.

Meanwhile, a spokesperson for the Queensland Police Service said toxicology results on samples taken from Katsidis's body would be included in the report to the coroner.

The results had not been made public.

In the 2009-10 season, Katsidis topped the Australian jockeys' premiership with 171 winners, including the AJC Australian Derby on Shoot Out, the horse he was to ride in the $3 million Cox Plate in Melbourne Saturday.

He died only two weeks before having his first ride in the Melbourne Cup on Shoot Out.