If is perennial ryegrass or fescue, it is most likely dead. If is bluegrass, it can recover. I would rake the area and seed with perennial ryegrass, in the fall you can mix it up with bluegrass and some fine fescue.

It could be a disease. Please post another picture showing the grass at the margin where it is both brown and green. Here's a sample showing how close you need to get. We're looking for spots like those on the grass in the picture. Generally centipede needs to be fertilized lightly once every 2 years. It should be mowed at your mower's lowest setting and watered about once every week or two.

It might be worthwhile to have an expert look at those spots and make sure there is not something in the soil there that is killing the seed. many lawn services have someone that is able to diagnose the problem and will do so for free, except for any lab tests that might be required, to get you going they will of course offer a program to fix your problem, but you don't have to accept it. at http://allenlawnmowing.com we just worked with a client that called with a similar problem which we were able to help them resolve it after doing some soil studies. We are in Texas and the situation is different but the help should be available in your area,

Ideally you would have seeded in the very early fall so that when the new grass came in, you could evaluate whether you still had bare spots that needed more seed. Then, because you made that determination early enough, you could re-reseed again in the thin spots. So make a mental note for this coming fall. The best approach for this time of year would be sod. For smaller areas that would not cost an arm and a leg. Why not seed? Because now is the time when crabgrass seed is germinating. If you water new seed, the first seed to sprout will be the crabgrass and not your fescue or Kentucky bluegrass. Also turf grass seed sprouted this late in the year will not be able to develop roots hardy enough to make it through the summer heat. One approach is to keep it like it is, clover and all, through the summer and redo things in August after the summer heat breaks. Clover is actually very good for the soil. But if you have to kill it, spot spray with Weed-b-Gon Chickweed, Clover, and Oxalis Killer.