My first guess would be a Scolymia. Just because I have seen one or two that divided into almost a branching coral like that with more then one polyp. It's pretty rare though (at least from the amount that I have seen).
The pink/red flesh looks rather transparent to me. Plus the septa along the corallites are rather well defined. Scolymias are sometimes extremely thin as well - the one's I had all were.
Well I can tell you that it is not dead. It started out as a small spot and has been getting bigger. I first thought it was just some cyano or red algae.