The head trauma reported may have been artistic licence by the reporter, I honestly don't know.
There was a lot of blood, but I can't tell where it's coming from and my source reported a broken neck as the cause of death (second hand Thai source so take that as you will). Difficult to see 100% due to the shadow of the umbrella, but it looks like a full face helmet.
I'm not aware of his identity but I don't believe I knew him