TMZ broke the story ... David was rushed to a Florida hospital earlier this week. His organs were failing and he was in desperate need of a kidney transplant.
Sources now tell TMZ David has taken a turn for the worse ... he now has a breathing tube and doctors say David's prospects are grim. As one source puts it, "There's really no issue anymore for a transplant. It's futile."
TMZ is told doctors have summoned David's immediately family -- his son and ex-wife -- back to the hospital for what could be their final visit.
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