Hi Michael,

I confess I'm not the greatest resource when it comes to turf (not  a fan). I am preaching to people to reduce the size of their lawns and instead plant borders of shrubs, perennials and trees. However, back to your question, here is a link to look at;

https://apps.extension.umn.edu/garden/diagnose/plant/turf/circular.html

I would really need to examine your lawn closer to know what the issue is. I can tell you it doesn't look like beetle grub damage. 

https://ag.umass.edu/turf/fact-sheets/dollar-spot#:~:text=Dollar%20spot%20is%20caused%20by,bleached%20to%20straw%20colored%20spots.

https://apps.extension.umn.edu/garden/diagnose/plant/turf/discolored.html

I would get a rake in there and get some of the dead grass out to allow for more air circulation.

I can't say much more,

Best of luck,

Sally Granath St. Louis County MG