TFX20JR GE ICE MAKER LEAKING?

My ice maker has not worked for several years. Water was not getting to the mold. But now water is leaking from somewhere inside the ice maker. The water drips down the back of the freezer and forms a long streak of ice. I cannot find a water shut off valve, and my home builder didn't put one on the water line. Is my only solution to clip the water line and cap it?