If there is a lot of green plant left then snip off the dead leaves and bag them, spray with Daconil. Can't hurt. If it is all brown then I figgure that plant is a gonner.
I am no expert ever if I see pictures of tomato deseases. Fortunatly only had to ever deal with some Early Blight. Early Blight is the most common of the tomato fungal deseases anyway.