I bet you the tree would show signs of disease if examined, unless this was during some exceptional event.

I maintain timberland, a percent of dead and diseased trees are normal. It is highly unlikely, at least in the species I’m familiar with, that a tree will just fall over.

Evolution tends to select against that kind of thing.

Notably, parks get sued pretty frequently when trees drop limbs on people or trees fall on folks stuff, under exactly this principle. It works too.