For the same reasons as John, I would definitely say Dr. Mayfield.

And for the same reason, Ruth over Abigail. since Ruth drags another person into her murder, frames him and kills him, then frames Janie.

Of course, at least her murders are a hundred times QUICKER, so there's that.

#2 I'm leaning toward Fielding Chase. Ward Fowler, while he plans the murder of Claire and attends to many details (the drunken baseball set up with Mark, Sid's sweater string on the gun) still seems to be bumbling along, enjoying what amounts to an amusing game to him. Chase, meanwhile, is so deadly serious about everything. Fowler embraces the relationship with Columbo, Chase resents and is angered at all turns by our rumpled detective. The obsessive control he seeks to have over everyone and everything - most especially his own step-daughter - is what does it for me.

This isn't about murder, but you kind of have to wonder if Mark went completely off the wagon due to that drink that Ward gave him. I know it wasn't all alcohol, but it still might've happened. So that would be another thing.

Good point. Hadn't considered that.

#3 I'll take Ken Franklin over Greenleaf. The opening scene with Franklin pointing an unloaded gun at Ferris, foreshadowing the terror he will later inflict; toying with the emotions of Joanna Ferris by making and receiving the phone call ("I'm sure it's nothing but a practical joke."); the 'toasting' of the dead Jim on his couch...all those things (and a few more) point to a guy who enjoys this way too much.

I'd have to go with McVay over Justin Price, despite the horrible acting of George Wendt. McVay's - as portrayed by Wendt (so maybe he does deserve some praise) - comes off as completely cold. He kills his own brother and shoots him in the back of the head to do it. Price has to cover up one death and strangle another. He's visibly shook by what he had to go through to kill Linwood. He plays it coolly (and is portrayed by a MUCH better actor than Wendt) but McVay is a cold, cold fish in the planning and execution.