House Finches built a nest in my hanging plant. They had four eggs. Three days ago they hatched out. Today all?

House Finches built a nest in my hanging plant. They had four eggs. Three days ago they hatched out. Today all are gone except for one which looks as if it is dead. There has been no sign of the male and female finches yesterday or today. That is what made me suspicious and I checked the next. What happens? Could this be predators? It really makes me sad. I haven't taken the hanging basket down yet for there is one 3 day old finch in it, but it is not moving at all. Please help me with some answers..