There's several behind the scenes developments to catch up on before turning to this Nash episode. There is a definite shift in these last couple of episodes. These episodes feature longer dialogue sequences set in one locale, resulting in less set-ups, and therefore less costly production time and less costly action sequences. There still remains one or two action/stunt pieces to punch up the episodes, but the bells and whistles are getting trimmed away as the NB production gears down secure in the renewal of next season.
Also notice the appearances of Nash and Cassidy. Their screen time together is always rushed with Cassidy always having to exit when Nash arrives. This could be the result of the cooled romance between Don Johnson and Jodi Lyn O'Keefe (see the NashBIT "Number Four for Don?"). The producers are keeping them apart. She's on the outs with Don, and that's why you never date your co-workers.
In this episode "Lady Killer" the stomping/humiliation of Rick Bettina peaks with Rick getting framed for murder. Rick has always turned to Nash in his desperate times of need. Every time Rick begs Nash for help, he seems to sink lower until his next appearance. This time Rick owns up to his entire framework of incompetence ("I know I'm an ass.") while becoming indebted and grateful to a bewildered Nash. As if the murder of a prostitute in Rick's bed weren't sordid enough, we find out about his sexual addiction. As a repulsed Joe says "If any photos show up, I don't want to see them."
If Rick is an outsider to the SIU, so is homicide investigator Dexter Birdsong. Birdsong ends up being the killer for hire, leaving Nash saying "This one surprised me." If Michelle (played by Kelly Hu) doesn't show up in an episode soon, she might end up being a killer in a future episode. Where the heck is she? "Lady Killer" definitely ends on a different note with Nash dining alone (with book in hand) while partner Joe gets romantic with wife Inger. We all know Don Johnson ain't no "Lady Killer."
For more, see synopsis for Episode 50