Like, it's bound to happen at some point, right? Hulk takes a blind flying leap across continents and lands wherever the hell, usually not knowing what or who will be under him when he lands.
I know the chances of him landing on people would be rather slim, but you can't convince me that it hasn't happened at least once before. There's no logical reason to presume he hasn't accidentally killed someone by landing on them.
I'm just taking a wild guess for this part, but the Hulk probably weighs somewhere between 400-500 pounds on average, probably scaling with how big he gets due to his anger.
Now imagine a 4-500 pound green man speeding down from the sky at mach fuck and hitting a person. That's more than enough to kill, hell I'm sure even some heroes or villains with higher durability would be crushed still.
All this to say, has it ever happened? And if not... why not? It seems like something that'd logically occur eventually across all the universes Hulk exists in.