If they haven’t gotten him now I doubt they ever will. Solving murders isn’t like on CSI/copaganda show of choice, and this type of anonymous killing is the hardest to solve. Especially since the list of people who had reason to want him dead may as well just be a list of anyone screwed over by a health insurance company(+family & friends, so basically everyone in America).

Yeah, but that's the thing. It's not like they're gonna just admit defeat in this situation; this is gonna get treated like the punishment of a royal assassination case in the middle ages. Somebody is gonna have to take the fall for this, whether they actually did it or not, and it's probably going to be made in the most openly cruel way possible.