Here's some British ones, are they commonly known to yanks?
Dennis Nilsen
Fred and Rose West
Peter sutcliffe, the Yorkshire ripper
Harold Shipman
Beverley Allitt
Robert black
Ian Brady and Myra Hindley, the moors murderers
Levi bellfield
Mary Bell
Jamie Bulger killers
Other than Jack the Ripper I've heard of but don't remember details about, the West's, Sutcliffe, maybe Mary Bell, maybe Bulger but I might be confusing that with our Whitey Bulger mob guy.