Jess McCurdy would have made a great murderer. She already had the tough as nails personality and had an attitude during the whole episode.

But Murder in Malibu episode just didn't do it for me.

Ida Lupino appeared in two episodes and was the victim in one of them. She could have been a good cold hearted battleaxe murderess easily

I've always been able to imagine Murcheson killing Karl Lessing. Murcheson was madly in love with Viveca, and as far as Viveca was concerned, Karl was almost singlehandedly ruining the business by running off with the formula.

And obviously there's the fact that the formula was HIS.