[mmyoung]

ecordero — I think you can just select the style as if you were going to draw something; the "Delete Style" command will then become accessible at the bottom of the menu, and you can delete it.

I'm new to this, so I may not have all the wheels and cogs figured out, but it looks like you can't delete a style for and extant object. It seems like you have to open a fresh file (it will appear in the newly created file) and delete it from there. I think. Maybe.