I would say Tony Galper in "Columbo Likes the Nightlife."
He wasn't just a bad guy, but his death was an accident while Vanessa was defending herself.
In the same episode, Linwood was also a despicable victim, but that was a cold-blooded murder, which makes it harder for me to say he "deserved" it.
I was seriously considering those two also quid.
Yeah, Edna got what she deserved!
I don't know about deserving it, but Karl Lessing really "asked for it."
Not only did he PRETEND he was willing to negotiate with Viveca, he also pretended that he wanted HER back.
Another vote for this bum.
Everybody hated the creep. He treated his business partner and staff like dirt.
And, worst of all...
He was willing to ignore Santini's secret career in the Nazi SS if he paid him off; and....Jerome was Jewish.
Santini deserved a medal....before we gassed him.