It looks more like a Southern Black Widow (Latrodectus mactans) to me. Northern Widows (Latrodectus variolus) almost always have a divided hourglass, whereas Southern Widows have a complete hourglass. And judging by the complete hourglass that is shown in your 5th image, I would say it is a Southern Widow.
I can see why you might think it is Northern Widow, though. Granted, your specimen seems to have more red markings across its back - a feature more common in Northern Widows - than a typical Southern Widow would have, but this feature varies greatly among individual spiders and is generally not the best way to establish an ID.

Hope this helps...