We're told doctors have put him on something called ECMO, or extracorporeal membrane oxygenation. It's a technique used to oxygenate his blood outside of his body, before it's pumped back into his body.
It's essentially a form of life support, and a clear sign of how dire the situation is.
4:50 PM PT -- Rick's family denies he is on ECMO. As we reported, they also denied he was hospitalized.