Hiya, its always hard to tell from a picture however it does not look like a lack of water or any nutrient deficiency.So my guess is some sort of virus...perhaps tomato spotted wilt virus. Trying searching this in google images and see if any of the images look similar to your plant.

I read up on tomato spotted wilt virus. What I have going on doesn't look exactly like the pictures I saw, but there are some similarities. I didn't really see any info on what this means for the plant or how to treat it. Is the plant a goner? Should I just take it out?

I'm no expert on this, but i think this is the virus that affected mine a few months ago. anyway mine deteriorated quite quickly and then the plant next to it started to show the same symptoms so yanked both of them quick smart as i believe the virus is transmitted via thrips. The others survived.