Q.peach tree appears to be dead 8/24/2017
I think it may be fungus. Will I need to cut it down?
I can't make a determine for you with this information.
Here are some links that may help you determine the health of your tree.
https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/peach/treating-x-disease-in-peaches.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/common-fruit-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/what-is-gummosis.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spraying.htm
https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm
https://www.gardeningknowhow.com/plant-problems/disease/weeping-amber-in-trees.htm
https://www.gardeningknowhow.com/edible/fruits/peach/spraying-peach-trees.htm