Oh, wildflowerchild! I am so sorry.
I think he is around the age where they start to understand death, so it may just be that, but I am glad that he will be getting therapy to help.

(I also felt compelled to write because the last time I talked with my own son, I learned he watches very disturbing videos online. He is an adult now, but still, it breaks my heart, and I felt that pang for you -- the discovery, the heartbreak. He refuses help on any front, so I am especially glad for the help your son will receive.)