It looks like a rather obese Blair's phase Gray-banded Kingsnake (Lampropeltis alterna). However, the pattern on the head suggests it might have some Lampropeltis mexicana, L. ruthveni or other blood in it. It is tough for me to tell.

There are a number of hybrid lines in the hobby that were produced in order to get the albino ruthveni genes into gray-bands. Many of those lines are long since forgotten, but their genetic footprints keep showing up.

If you post a photo on the gray-band forum and include a head shot, the people there will give you some more "expert" opinions.
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Chris Harrison
San Antonio, Texas

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