I am sorry to hear about that...often it is when we lose someone that we really grasp their impact on us. I can somewhat relate because one of the people I acknowledge in my novel for his technical advice on hospital routines took his life just a couple months after the novel's release. It was very unexpected and somewhat tarnished the excitement of the publication. It's really disheartening to know I will never be able to turn to him for any thoughts or tips as I continue to write ever again.