Can I find out how someone died?

Long story short, I have a friend from high school that passed away a few days ago. Everyone is being very weird about the whole situation. He was 26 and unmarried so his parents and grandparents are handling arrangements and have stated that services are invite-only, and only immediate family is to attend. Every time an RIP post comes up on his FB page, a little bit later it disappears. And his obituary was 2 sentences. That he passed on xyz day and no public services planned. I don't know anyone well enough to ask, and it's rude to do so. Plus, it seems his family aren't even willing to discuss that it even happened or allow anyone else to do so. I can find no news articles relating to a car accident or anything like that. Is there a way to find out what happened to my friend?