I lost my brother (in law), which I really considered my brother, to a heart attack one month before the 2007 season started. He loved fantasy football so much and at times, it was all he had. He was the heart and soul of two leagues that I play in. We had already been having major discussions about the upcoming season, and then boom, he was gone. In the league that I commish, we dedicated the season to him and named the trophy after him. It wasn't hard to find a replacement for his teams. The person who took over his teams kept his team names and took both of them to championships. The last thing he would have wanted would have been to call the season off. He was very special to everyone in the league. We are now going on our second year without him but we all remember him every time we log on to the site. Granted, we didn't lose him during he season, but as a commish I would have found a replacement owner that was special to him had we lost him mid-season.
Keep the season rolling and dedicate every last moment to him. Sorry for your loss. I sort of know how you feel.