Redwood trees (2) green to brown

[ontargett]

Hi, I have two redowood trees in my backyard (50 feet each) that are next to each other and over the summer went from green to brown. The branches are turned up at the ends. I have others in the yard that are green and about the same age. Help.

 

[Sheshovel]

Redwoods need cool moist air and water.they are dead,post pic's