There does not appear to be any issue with other leaves that indicate a larger problem. I suspect that this branch is simply broken. Perhaps it is cracked in some way that is not immediately obvious. You can just prune (of have a tree service) prune this dead branch out.

Sometimes one branch dying like this can indicate a borer or a particular disease starting for certain tree species. However, this species is not troubled by the pest problems that display with a single branch failing. 

Take a close look at the branch, it is probably just cracked/broken and can be removed.