The author should not be profiting off his role in the crime by writing a book about it and your father. But I don’t know if the proceeds from sales of the book are going to help the addicts he now lectures. If so, at least that could be a positive.
I have not read the book - and don’t intend to - but, although I understand it might be written by the author putting himself in the best light possible, the fact is he helped your father murder people and he went to prison for doing so. It is impossible to clean that up.
The bottom line is that the murders were covered widely by the media and your father was featured on national TV and your father was one of America’s Most Wanted. Family and friends of your father are naturally going to be affected by their relationship to him.
I’m sorry. You were awfully young at the time of your dad’s crimes and subsequent suicide. I am sure it was not easy growing up and the book’s release a few years ago had to add to the pain.
But I do not see a legal action for you to pursue. You can speak to an attorney in your area, however, to see if he sees a legal action I can’t.
Good luck.