PS My care would be to get them in detox and long term treatment... if they refuse they're going to one of three places... jail, institutionalized or death. And they are on their own, what happens to them is a product of their choice not to seek help.
Also I am sorry for your loss... you are truly one of the victims of the scourge that is addiction. I have lost more than 10 friends and my brother who wouldn't accept help and did a lot of destruction throughout the years, so if I sound frustrated.. you betcha.