Hedges: Ceder trees dieing

I have a few cedar trees and 2 of them look as though they may be dieing. I have no idea why but is there something I can do to prevent them from dieing or is it to late. They are turning brown in color where as the other trees are looking greener then the 2 in question. The 2 trees are in different locations so I dont suspect that they were damages or anything just kind of odd that they would die all of a sudden. They have been in the ground for 2 years now and have been fine for the entire time until now.

Any help would be great.

Anker.

 

Lack of water this summer maybe ?

 

Can't think it would be lack of rain, cedars are very drought tolerant (in the wild, Lebanon and Atlas Cedars get almost no rain at all for the whole summer)

Can you post some photos?

 

Guessing they are not true cedars and are Thuja, Michael. Maybe wrongly.

 

I will post some pictures later this week as Im in camp at the moment but thanks just the same.