Start out by checking to be sure it was not planted too deep, mulched too deep, overmulched, etc. Otherwise, contact your local Extension office. You may be looking at a disease issue. Personally, I have seen container Viburnum suffer from Phytophthora and other root rots. They can also suffer from shoot blights caused by Pseudomonas and dieback from Botryosphaeria.

With the sparse info provided, impossible to tell. My default in this situation is improper planting. Take good pix and I second the good advice about Extension Office.

Dan

Thank you.
I had check on the roots and is all rot!!! Amazing...
The only part with healthy roots is right bellow the healthy looking part of the bush. So, after some reading I truly believe Stompede@ is right..
It is a terminal case ;-(

I'm so upset!! It was my taller bush and the most expensive one!!! F**** !!!