Didn't watch all of it but I think he was dead dead by the 35-36 min mark, he was convulsing in a very repetitive pattern that shows signs of last nerve firings to me, breathing takes a while to stop, your brain is usually very dead before your breathing stops.
Could be wrong, I'll finish and edit if I think there's a different moment.
I think the black stuff he vomited was partly wine, partly blood. He was definitely foaming near 32-34 min. He seemed to lose any semblence of consciousness about 20ish minutes in, he was staring but it seems very, very blank, like he's hallucinating. While he was certainly awake for a lot of this, I don't think he was "there". So to say.
Exit: 38 looks like death rattle, but again, could be wrong.
His skin color changing is weirdly interesting to watch between 40 and 41 min. Someone please correct me, is this the capillaries bursting? Or just leaking? I'm not as knowledgable past the twitching and breathing.
Edit: I will add that there are several "false" deaths as it works, his breathing gets so shallow you can't see it, then he gasps for air. When the repeated movements happen, if he was aware of this throughout, it stopped about after 5 minutes with the repitition, but I'd say it ended before that if I had to guess.
Edit 3: his skin gets reaaally dark near 45 min, still "breathing" but it's very slow, almost like it stops a couple times as the lungs inflate. It's weird to watch. He hasn't shit his pants yet so his body is still somewhat alive.
47 min his skin gets a certain color that makes me think his heart is still beating, but barely.
I also want to add death rattles can take a long time to stop. Took about a full day for someone I knew when it started. The body tries extremely hard to hold on. Granted he was hooked to machines but still.
50 min, breathing is almost imperceptable but there. It's very hard to notice between how shallow and long it's taking, about 30 seconds between inhale and exhale.
Livermortis is when blood pools to the bottom so that's not what it is but it looks like his blood stopped circulating. The color changes stopped and look almost bruised at 55.
He officially looks dead by 54 minutes.