Where's the cat going to live?
At a crucial moment, just after the defense had rested its case and he becomes convinced that they'd not only lose the case but would actively contribute to Naz being found guilty, John Stone basically gives up. This includes giving up on the cat he'd rescued from Andrea's house. He returns the cat to the city pound. He throws away its litter and food. The feline's fate is seemingly sealed.
After the trial ends and retrial is nixed, he's sitting in his apartment watching TV when one of those heartbreaking "adopt a pet for just $18 a week" ads comes on. It's using Roberta Flack's "First Time Ever I Saw Your Face," which is nearly a verbatim quote John Stone used in his closing statement regarding his initial encounter with Naz. It would have been very sad if Naz had been saved but the cat hadn't, which is why the sight of the cat strutting across the apartment after John Stone leaves his apartment to go the police precinct to take on another case provided one of the series' most welcome moments.