Since you have turned off the water supply both for the ice maker and for the WID going to the fridge I would suspect that you have a frozen Defrost Drain line.
I had a similar problem with my Samsung RF197 but in the fridge compartment. The Defrost Drain Line was frozen therefore the water which came off of the cooling tubes during the defrost cycle had no where to go except inside the compartment.
Here's the thread that I had posted with photos and the solution to the problem.
Frozen Defrost Drain Line - Samsung RF197
Unless you are very handy and this is the problem I would have a service tech do the repair.
Or you could follow this Do-It-Yourself fix which could be temporary or permanent depending on the severity of the problem. Mine needed a different part to permanently fix the problem.
How to Fix a Maytag Fridge's Freezer Leakage | Home Guides | SF Gate
Dr4Film ----- Richard