Need help identifying this shoe print

A friend of mine had an intruder try and break into his home. Upon inspection of the surrounding land, he found this footprint and we are having some trouble trying to determine the model. This seems like an appropriate place to try and get more eyes on it.  Because the pictures are awkward to post here in a high enough resolution to see the detail, here they are:    Thanks in advance.

I see you Gil Grissom.