Will mucormycosis kill me?

Very risky. Mucormycosis is a fungal infection that commonly affects immunocoromised individuals. It has an extremely high death rate even when treated properly. The risk ranges between 25% and 85% depending on body part involved and underlying health.
If uncontrolled. It can be fatal, as with many different infections. I've personally seen a fatal case when it was left improperly treated.