Same here. I made the mistake of reading that first one as I didn't realise he had died. About the same time that I'd discovered Paul Lindsay had died. I'd enjoyed his two books written as Noah Boyd and had been looking forward to a third.I've experienced something similar.
When Vince Flynn passed away, Kyle Mills took over writing about Mitch Rapp. I read the first book that Mills wrote but won't buy any more because he absolutely butchered the character and alienated a lot of the fans with his trashy writing style.