It's not 100% clear without context, but mold can have a pink color. "Rings" are typically associated with bathtubs, not showers, though. But a dirty, slow-draining shower could get a pink ring, I imagine. "death" seems like a bit of an exaggeration if the author is, indeed, talking about mold.

I am the head cleaner of my family. I can tell you for sure that they are talking about mold.

I appreciate your great help.

It means the shower drain is dirty. No idea why it would be pink. Perhaps the death refers only to it not being healthy.

Thanks