My brother also died of an accidental overdose around the same time as yours. He was a recreational user rather than an addict, but also started using following a traumatic event - he had mostly turned things around and was doing well up until his death. There was no attempt made to investigate who the drug dealer might have been, as my brother was not famous and as there were so many other overdose deaths that the police simply didn't have the capacity to investigate all of them. Any time that I read about the opioid crisis, idiots comment that it is "natural selection", "junkies deserve it", etc. I suppose it never occurs to these idiots that the relatives of those who died from overdoses might want to read articles and comments about the topic.
I do feel sympathy for Matthew Perry, and am glad that the investigation has highlighted that there are some physicians who are simply glorified drug dealers. I assume that these same dealers are also responsible for the deaths of others, and at least they will not be able to kill more people from jail. But I do feel bitter knowing that Matthew Perry gets some justice, while so many others do not.