If you've never heard of these criminals, consider yourself lucky. For this list, we’ll be looking at the freakiest and most depraved serial killers that don’t often get mainstream attention.
scariest killers you've never heard of, killers you've never heard of, serial killers you've never heard of, serial killers, killers, scariest killers, scariest serial killers, scariest murderers, worst serial killers, worst killers, crimes you've never heard of, crime, criminals, death, murder, deadliest serial killers, lydia sherman, deadliest killers, karl denke, killer, amelia dyer, patrick mackay