Mark, your water valve has screwed the pooch. Replace it. The part number is
2199838.
What's happening is this... the valve that fills your ice maker is by-passing a small amount of water. This water has to flow through that tube, right? When very small amounts (drop by drop) go through the IM fill tube, they flash freeze. Eventually they (the frozen drops of water) form a big block of ice inside the fill tube. This ice creates a blockage which creates back-pressure whenever the IM "calls" for water. The back pressure eventually blows the tube off of the connection behind the fridge.
You say that this happened over night... no way. If you look closely at the ice cubes that you IM has been making, you'll see that they are hollow. Hollow cubes means that your IM isn't getting enough water... (because the fill tube is blocked).
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