I don't generally agree with Headache about this, but I do agree that Adrian wasn't THE MOST "likeable" murderer on the show, which seems to be a popular opinion of him (though he WAS "right up there"). One thing I've always noticed is that Donald Pleasance made almost a career out of playing either mild-mannered characters, or "Jekyll and Hyde" types, who were only partly mild-mannered, so it's always bothered me slightly that his most famous role (in the "Halloween" movies) wasn't EITHER of those kinds, and that Adrian (civilized person though he was, apart from the murder) wasn't really "mild-mannered" either. The funny thing is, in a "Mrs. Columbo" episode (about the only one I've seen more than once), he DID play a character like that. And in spite of the bad opinion many people have of that show, his last scene, with Kate Mulgrew, was really worthy of a Columbo episode. It showed that same relationship between the detective and the murderer.