[JThiessen]

In the photo, in the lower left side, there looks like there is a hole/dent in the material. That looks like its possible a bad spot in the material (could be a void/inclusion) that could have been the cause of the shear. Can you get a better picture of it? Do you have the mating portion? If you look at the material, it should all look like the upper right portion if the damage was 100% shear.