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Argiope aurantia
Long brown and black legs gray upper body. This also had yellow or white spots.
Oklahoma around OKC
It goes by these names as well: Black and yellow garden spider, Writing spider, or Corn spider. (like I posted in the Suggest an ID part :P)
This is a garden spider. The female has more yellow in her and they make zig-zag shapes in their webs. They aren't poisonous .