Sometimes its best to trust your gut. Welcome to WatchMojo, and today were looking at instances in which serial killers were suspected of committing crimes before they were officially identified and caught. Our countdown of serial killer theories that turned out to be true includes people like David Berkowitz, Paul Bernardo, Ted Bundy, and more! Do you think you would have caught these red flags? Let us know in the comments below!

Watch more serial killer videos here:
10 Serial Killers That Are STILL ACTIVE: https://youtu.be/HEKmC0y4nqk
20 Cold Cases That Were Finally Solved: https://youtu.be/aFlo8G7NpsM
Top 20 Serial Killers Who Were Never Caught: https://youtu.be/S8eo4-URLpA

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