I would first check to see if the water line between the water inlet valve to the ice maker is not frozen shut. I do this by blowing air through it.

Then I would check the water inlet valve.
Can be checking with a ohm meter or home made test cord to apply power to it.

If the water line is not frozen and the water inlet valve test ok I would suspect the ice maker is at fault.

I most often find a frozen water line or faulty ice maker on this type of refrigerator.