In part, yes, it is just that it is a determinate variety. Unlike indeterminates, once the terminal (top) bloom sets fruit the plant slowly begins to die.

But you may also have some sort of disease process going. Without seeing the plant or at least a picture of it we can only guess.

You might want to post a photo if possible over on the Tomato growing forum here.

Dave

Here's a pic.. sorry I thought I posted this on the tomato forum. I actually saw some new baby tomatoes so I want to leave him if not contagious. They all have a bit of the early blight but it is only the lower leaves and I have been spraying seemingly successfully. Maybe give some miracle gro?

The tomatoes are all crammed in between marigold plants that have pretty much taken over the garden. I had no idea they could get so big, and thankfully very beautiful!