I'm ghostwriting a nonfiction book for a client who works at a prison in California. I have suggested he change the names of his coworkers to avoid potential lawsuits. However, my client wants to keep the actual name of an infamous serial killer and write about the killer's stay in the prison. Is it allowed (or wise) to use the serial killer's actual name? This is one of the most notorious killers in America, so many people will recognize his name (think the Zodiac, or John Wayne Gacy). Is there any worry in coming across "slander" charges or other types of legal action due to using his real name? Or should I just stay away from the entire issue and change the infamous killer's name?