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You will need to use a fungicide on it. This article will help:
https://www.gardeningknowhow.com/lawn-care/lgen/grass-fungus.htm

The following article should be of some help to you:
https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm

You may have grubs or a fungus. Both would cause these issues. These articles will help you determine which:
https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm
https://www.gardeningknowhow.com/lawn-care/lgen/grass-fungus.htm

Neem oil would still be effective this time of year. This article has more info on neem oil:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

You'll first need to take care of the grub problem, then you can focus on fixing the grass by either re-sowing the dead area or re-sodding. You'll also have to fertilize it. Occasionally, the dead grass will come back on its own following grub and fertilizing treatment.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm

There are several things that could be causing this. My initial thoughts would be that you have severely compacted soil, or the type of grass you had planted in the front is susceptible to the weed killer that you are having sprayed.

Diseases and pests normally show themselves in patches and spots that spread to take over a lawn. They normally do not strike a lawn all at once.

Examine your soil and see if it seems compacted and if it is, aerate the lawn. Also do some research into what you would like to reseed the lawn with. You may find that a different variety does much better there.