I would like to mention in an article a scientist that passed away in 2015 and was universally recognized as a pioneer in his respective field. Since many knew him personnally, I would like to mention him respectfully, such as 'the Late Dr. XXX' or 'Honorable Dr. XXX'.
I am afraid it would be unethical, especially considering that many other authors that I mention are also gone (but few people really knew them) ?