I am a cat lover ("catpurrson", so to speak...), too, "owned" by two kitty boys. So, I can definitely relate to their mutual connection, along those lines. And, I was touched (as I'm sure that Lily was) when it was discovered that Kenneth's character had "come back from the dead" to use his credit card to pay for one of his kitties to see a vet (considering his status, as originally set up in his character's storyline). Lord knows that *I've* done the same for my own kitties, in different circumstances (of course), but when needed, 'cause that's what one does when one is a cat lover.
I think that this storyline has some great potential, as part of the cliffhanger ending for this season (to be carried over to the next season). And, I look forward to its resolution in the future, with (possibly) more appearances from Kenneth Johnson in that role.
By the way, "Cold Case" has been renewed for next season on CBS... Also, Kenneth Johnson did play the role of "Lem", on "The Shield".