Watching any crime drama makes you think the technique of profiling to catch a killer has always been around. Not so as Ron Franscell explained on a visit to Maine Street. Ron's book "Shadowman: AN Elusive Psycho Killer and the Birth of FBI Profiling" talks about the baffling case that helped bring this tool into use.
http://accesswdun.com/article/2022/3/1082042/listen-how-the-process-of-profiling-came-to-be