Plenty of videos out there of people in the process of ODing on fentanyl.
I just watched one in particular where the gentleman is sitting on a chair outside in a backyard. Buddy in the chair ODs, but just looks like he has fallen asleep sitting upright. Man calls 911 and advises the guy is ODing. Girl makes comment that guy in chair is a user (snorts) to the officer who arrives. Cop arrives with bodycam and administers Narcan, rubs chest, moving guys head --- talking to him and telling him to breathe etc. Ambulance arrives. More Narcan (injection this time). He slowly comes around. He has no clue what, this lasted for minutes, happened to him - oblivious. Off to the hospital.
He didn't move. Didn't make a sound. Oblivious to the fact he was ODing and needed help. Just sat in that chair. The two sober people who were right there were his saviours. In good weather. With two sober people within touching distance of him. He is alive only because those two sober people were right there. No one would have "heard" anything. No one would have "seen" a fuss or commotion from him, Nada ... just nodded off without a clue in the world.
I can only imagine death was much, much quicker in the cold.
It's horrific. Quiet & horrific.
Unsure if linkable, but a google of Officer gives man narcan after overdose should bring it up.
Edit to add: Officer immediately asks if he has "pinpoint pupils" ... a clear sign of a fentanyl OD. I imagine that officers at the scene in this case would have identified same --- and ergo the early statement of no sign of foul play. There simply would have been signs of a fentanyl OD, pending confrmation of tox.