What killed the Godzilla in the 2014 movie

Remember in Godzilla 2014, in the beginning, they found a skeleton that was said to be the same species as Godzilla? Did you ever wonder how that Godzilla died? It is so hard to kill Godzilla and if that creature is the same species, then why does it seem as though he fell so easily and what was responsible for doing this?

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