The conspiracy folks only real suspect is his friend from WKUK who lived a few min away and got his director dream job.

I could see this being plausible, with the caveat that it would've been accidental manslaughter than murder, according to all of my armchair experience.

As in I'd believe they could've got into a fight and someone might have pushed him, maybe even on purpose to a fall, but honestly, unless you're pushing someone off at least like the 5th or 6th floor. What I mean is that a person might die from a smaller fall, but I wouldn't be confident enough that they'd actually die right away, before being able to tell someone that I'd thrown them out of a window.

Because humans are sometimes incredibly durable. Especially when super intoxicated. Alcohol can protect from serious trauma in a couple of ways. I don't remember, it was maybe like a "This is not happening" or something but some standup telling a story about how they walked off from the third floor accidentally while super drunk and actually had very minor injuries due to his body just not realising it's falling and then naturally taking the impact, instead of turning in the air and trying to brace for an impact. (Or perhaps it was this qi episode I'm linking now)

There's even quite a lot of science on it.

QI vs alcohol

I myself pretty much rearranged my ribcage the other year, with about 2-4 heavy impacts which I estimate were about the same as me dropping on my handlebars from about 3.5-5 meters. I got an ebike you don't need to pedal, basically an e-moped disguised as a bike so I don't have to insure it or myself, which in retrospect was pretty dumb now that I've permanent injuries. I even broke the suspension on my bike clean in half. It had a problem before so it was stiff and maybe bent, but they still snapped clean in half, both front suspension pipes. It's a wonder I didn't hit my head. I was not wearing a helmet. I think I might have killed myself with poor luck. (Although I credit some ukemi training from judo when Inwas like 6, must've gone into my falling instincts at a young age.)

But again I haven't seen any footage or even the building or whatnot. But just seems like a somewhat unreliable murder method, pushing someone out a window. Except they do sort of like it in Russia... But they usually don't have to worry about consequences.

Perhaps if you smash their head in first then throw them out, but wouldn't a medical examiner (not a coroner, they don't need to be even medically trained, they're elected) be able to tell?