There are definitely situations where you can pull the plug. Brain Death = Death for halacha, however most times there is some brain activity and it gets complicated. But IINM, with TRUE brain death, there is no recovery, and you are allowed to pul the plug.
Based on that RC is at best on life support with significant brain activity. Some might argue that in fact that is not even RC in the hospital, but a figment of someone's imagination, while the real RC is running around outside. Somewhat asthmatic or out of breath perhaps, but definitely alive and not under constant medical supervision.