Let me start off by saying that I am a total beginner at all of this. I purchased my house a little over a year ago and I have managed to turn my lawn into what my neighbors say "the best it's ever looked" and "the best looking lawn on the street" which isn't saying much since everyone else's lawn is horrible to say the least(but I am proud of the progress). The only products I've ever used on my lawn are lesco pre emergent and Milorganite. So A little background on the situation. I've been working a lot the past month and a half and didn't have time to mow my lawn. So finally when I did mow I saw these dead spots on my grass and can't figure out why they're there. I haven't done anything out of the ordinary besides letting the grass get super tall during that month and a half. I've still watered twice a week a half inch each time and it's just this part of my lawn that has these dead spots. Any one what could have caused this and how to fix it?

This is what is looked like before the brown spots


This is what is looked like before the brown spots
