My father in law passed away

Hi Coach
8 years ago my father in law passed away. When he died a part of my husband died with him and he hasn’t been the same since. He is depressed, sad and unmotivated by life. Needless to say it has taken a huge toll on our relationship. I don’t know how to support him in overcoming his grief. He had counseling for a whole year and got very little out of it. How do we move forward?