Appropriate way to delete this pointer

It happened that I need to manage some other people's source code. In the source, I found that a pointer it was instantiated as below was not freed after being used:

TCHAR** val= NULL;
val = new TCHAR*[MAX_NB];

However, I am unsure the appropriate way to free up the pointer. I am wondering the followings:

delete val[]; // <----- is this appropriate? or should it be "delete val[][]" ?
val=NULL;

I am quite young on c++ programing, and need some advice from experts.