It looks trampled. Is it the only one that's damaged in any way? If it is, then I think it's a disease... coupled with the wilted tomato plant, I'm wondering if it's Verticillium wilt.
Hope someone can tell you what to do about it.
One thing though - I notice from all the photos you've posted that you haven't mulched your plants. I think that's probably the first thing you could do. And if you can, mulch with compost. If the dead/dying plants are due to V wilt, then they should be removed first with soil around them and put in the trash.