Walnut tree disease

[MMB]

My grandfather's favourite walnut tree is becooming compleatly dry and the leaves are falling. Can you smart gardeners help out and identify what the problem is?

 

[Chuck]

Impossible to tell from a single picture. Contact a professional arborist.

 

[DirtMechanic]

Does it have advantageous growth from the middle of the trunk, and a general failure to grow at the tips of the normal branches? Those mid shoots are signs of decline and are not called suckers like I thought. An arborist taught me that when he came to treat a tree here. This pic is how they gave the treatment systemically. I cannot make much of your picture either, its hard to see the nature of the problem