..has died. There is a big patch of grass that just died on my front lawn. Any idea what might have caused this. The lawn is tall fescue and I live in the St. Louis area. The rest of the lawn is ok. There are a couple of dark spots but nothing like this. The little brown spots are from the dog and I havn't repaired them yet. But the big spot looks like a cow layed down for a week. The second picture show the rest of the lawn. The first picture would be just off of the second one on the upper left side. Any help / advice is greatly appreciated.