I need help

I was actually going to post this earlier today but didn’t. It seems almost every post is about a spouse or life partner. I desperately need some help that’s appropriate for a mother watching her son (27M) die.

This evening my son wrecked his motorcycle, drunk, not wearing a helmet. He has refused help many many times. He’s been to rehab twice and left both times on day two. He won’t go to a therapist bc “it won’t help”. He lives with us and we gave him a deadline: end of September. I don’t even know what to do. I hope someone has some kind of advice bc I can’t think straight.