I was watching the Amazon Prime show Jack Ryan and noticed that Tom Clancy is listed as an executive producer on the show. Tom Clancy passed away in 2013, at least two years before it was announced that there was a Jack Ryan show in the works, and 4 years before a director was announced for the pilot episode.
The Tom Clancy estate has continued to market books with his name displayed prominently relative to the actual author, so I'm curious if this is an exception that was made in the same vein.
For example, this book was written by a different author 5 years after Clancy's death.
Is it common practice to award the deceased author of a character an executive producer credit on the character's TV Show or Movie? If not, have Amazon or the Clancy estate explained the reasoning?