Rodney Alcala - bachelor #1 murdered at least 9 women and potentially many more. Under the guise of a photo contest he lured many unsuspecting women to their death.
For more information
https://www.nytimes.com/2021/07/24/us/rodney-alcala-dead-dating-game.html
https://www.biography.com/crime-figure/rodney-alcala
https://abcnews.go.com/US/close-call-serial-killer-rodney-alcala-appeared-dating/story?id=75039197
