Does it leak constantly, or just once a day?
At the bottom of the fridge there's a catch pan to capture the water that's produced during the automatic defrost cycle. Check to make sure the drain hose is inside the catch pan, and not outside it. If everything seems OK there, you'll probably need to have the icemaker assembly inspected for leaks. That's usually not a DIY job, as it requires dis-assembling the ice maker to inspect the water lines and valve, and the re-assembly after.