Just my $2
And it's probably nothing people don't already know.
The killer was almost certainly male. He may have had a female accomplice, but very few women would have the physical strength to commit the actual murders. He was probably white because all the victims were and serial crimes usually follow the same racial line. He probably or worked in the area, because serial killers usually commit their crime where they feel comfortable and know the escape routes. He obviously had a good working knowledge of women's anatomy and he probably well spoken and likable, the exact opposite of what most people would expect from a killer like that which is how avoided being suspected.