Judaism and “pulling the plug” on a loved one

Please remove if this isn’t appropriate for this sub, but I wanted advice on the laws regarding ending life support and if there’s a halachically sound way to let a loved one pass peacefully.

My father has been in the ICU and every day another nightmare scenario comes true. So much of his body is shutting down and he’s no longer able to breathe, clean blood, or maintain a normal heartbeat. They keep having to shock his heart, and I know he can feel it no matter what they say.

I consulted with 2 rabbis, one of which said life was sacred and not to remove anything, and the other who said I should do what I think he would have wanted. What he wanted was to never have been intubated at all, but it’s too late for that.

I want to let him pass naturally and painlessly, with every machine unplugged and painkillers in his IV. Can anyone give me advice on what Jewish law permits in these circumstances?