I'm sorry that you are having problems with the ice maker. In this model, the ice maker can stop working for a few reasons. Some are listed below:
The icemaker itself can fail
The water valve may not open
The fill tube can freeze up
Freezer temperature not cold enough (should be 0-5 degrees)
First begin by turning the ice maker off for about a minute, then turn it back on. You should hear water filling the mold within 3 minutes.
If this does not work, I provided an image below that describes the function of the ice maker. This image also has the procedure for manually cycling the ice maker. Press and hold the cube size button (called the fill key on the image below) for 3 deliberate seconds. If it does not cycle, then the ice maker assembly (part 5989JA0002Q) will need to be replaced. If the ice maker cycles but does not fill, then the water valve (part 5221JB1004N) will need to be replaced. You can order the part from this link
Sears Parts Direct
If you need further assistance, please reply to this thread.