I'm so sorry. My cousin died in December from an apparent heroin overdose, got the toxicology back last week and it turned out her dealer gave her 100% fentanyl. Lethal immediately. So incredibly sad, for her, our whole family and for her 9 month old daughter. This stuff is so, so scary.
I'm sorry for your loss. Whatever feelings you have are justified. I wish your family peace. Fentanyl is sadly becoming one of the commonly abused substances and it is very easy to take too much. Hugs.