I watched a TV show many years ago in which they had a bunch of top detectives listen to everything which is known about the case.
I recall they had an agent from Interpol, one from the FBI etc.
After presenting all the evidence they had each one vote in secret who they thought it was.
Every single one of them voted for the Polish Butcher. Several suspects such as Queen Victoria’s Son were dismissed as absolutely impossible.
Was it a multi-day series of shows? Late 70s probably is the one I’m thinking of . . . for some reason I keep thinking Mary Hartman, Mary Hartman before or after so that’s the time frame I’m remembering. Wasn’t too bad of a program, especially for those times before Discovery, cable etc which today would do something like that.