A Brisbane hospital says it holds grave concerns for the health of former New South Wales State of Origin, NRL and English Super League coach Graham Murray.

Media reports had earlier suggested Murray, 58, had died this afternoon but Brisbane's Princess Alexandra Hospital said that he is still alive.

There was no official statement but the Sydney Roosters, whom Murray coached in 2000 and 2001, tweeted their condolences on Sunday afternoon.

One of his former clubs, the North Queensland Cowboys, has confirmed Murray's life support was turned off, but a PA Hospital spokeswoman says he remains ill in the hospital.

Murray has been in ill health for some time and was hospitalised in Brisbane after a suspected heart attack earlier this month.

He spent a week in a coma after a heart attack in March.

The 58-year-old was due to coach the Wynnum-Manly Seagulls in the Queensland Cup this year but stood down due to ill health.

Murray coached North Queensland and the Sydney Roosters in the NRL and coached New South Wales in State of Origin in 2006 and 2007.

In a long and distinguished coaching career, Murray also coached the Leeds Rhinos in England, the Hunter Mariners in Australia's Super League and the Illawarra Steelers in the NSW Rugby League.

He also played at the top level for both Parramatta and South Sydney.

Editor's note: An earlier version of this story covered reports that Graham Murray had passed away. The ABC confirmed with Murray's hospital that he remains alive. The story has been updated to reflect this.