If it was a medically induced coma because of an OD, he will be just fine. If we was going to die of an OD (from opioids) he would have died long before they even had time to put him in a medically induced coma.
The reason they sometimes put opioid addicts in a medically induced coma post-OD is so that they can ride out their acute withdrawal symptoms in peace, without having to feel them. It basically a forced withdrawal done without the person's awareness. Afterward, when the person wakes up, the worst is over. They did Rich a favor. This happened to one of my friends.