I'm skeptical. The initial threat to life from a burn is relative fluid shift from the vasculature to the interstitium causing hypoperfusion and eventual death. For the laymen amongst you, that means that your body's natural inflammatory response to injury draws plasma (the main fluid component of your blood) from your artery/vein system into the injured tissue. The loss of fluid from your artery/vein system means your heart has less to pump around the body and your organs (heart, brain, lungs, kidneys, liver, etc) don't receive the necessary amount of oxygen to stay alive, and once they die, you deteriorate until you die.

This guy survived several weeks according to the video, so he did not die from the initial fluid shift caused by his burns. Additionally, the video shows nicely formed scar tissue from several weeks later.

The secondary concern of burns is that it breaches your body's best defence against infection; your skin. Burns victims are susceptible to infection and must be treated carefully to make sure they don't become septic. Once again, nicely healed scar tissue 'weeks after the initial burn.'

I'd be more inclined to believe that the injuries displayed here were pre-existing, as the level of scar tissue is fairly high and, (I could be wrong) not entirely likely from scalding with hot water. I'd expect that to come from a much hotter and more sustained source of heat. I'll concede that I may be wrong, but that's the way I'm leaning until someone can provide, (more than welcome to by the way), more evidence to the contrary.

I can't see why this person would spontaneously deteriorate and die from his wounds after several weeks. His scars are nicely formed, and so a secondary infection is not likely unless it has occurred through some part of the body not displayed that was more severely burned that we have seen so far.

My current theory: pre-existing injury, they've thrown a pot of cold water on him, he's played up the act of being burned, made up a bullshit story of how she burned him, he died and now she's in juvie. Until I see a credible source to confirm his death and the mechanism by which it happened, I call shenanigans.