Totally agree Milo Janus takes some beating as a killer you want Columbo to nail. He was a total creep but all the better for it. Exercise has got to be hailed as one of the best and I never tire of it.
What I also love is the fact that when Milo kills Gene it is quite physical, which is inkeeping with Milo's profession but shows real aggression and determination that he could strangle the man after chasing him down - pretty tough for a Columbo killer!
One of his best lines to Columbo was "I don't care what visions you see when you look in your cigar ashes." (Comparing it to tea leaf reading and things like that.) He repeated the line later, when Columbo told him one of his deductions, sice he couldn't seem to prove it - "More cigar ashes." So it really started to sound like an actual expression.