No man can live well, who is not prepared to die well.
Doing what you love and dying, may not mean one dies well...one may die a lonely death, without telling their folks and loved ones how they truly feel. Or without apologizing to those one has crossed. Doing what one loves, is merely one aspect of life.
Besides, what if one is a hitman, and died doing that? Did that person "die well"? Did he did with honor?