When an author of a beloved character passes away, often their estates will cast a new writer to take over the job of keeping the character in print. V.C. Andrews, Ralph Compton, Don Pendleton, and Robert Ludlum are almost more prolific now than they were when they were alive.
There’s a webcast interview with Raymond Benson, who wrote the James Bond books for many years, and Robert Goldsborough, who wrote the Nero Wolfe books after Rex Stout passed away, posted at waukegan.org. Go to the middle of the page, find the section called "Writers Webcast with Chris Angelos" and download the link dated February 28, which is the interview.
I haven’t heard it yet, but knowing the two authors, I bet it’s an interesting peek into the world of posthumous writing.