I thought you were referring to
David Tennet as the mass murderer
Denis Nilsen who he looks so much like in the publicity photos.
Very much looking forward to that.
I saw Nilsen once drinking in a Soho pub from the other side of the room. I recall at the time thinking what a hideous creepy looking man he was and wondered how such a gay unattractive man like him could ever attract anyone.
Could have knocked me down with a feather when 18 months later all was revealed.