FINE. Most TV detectives have had an ex-lover show up from the past. The Hunter take on this plot manages to avoid the pit-falls. In fact, this is a generally strong episode, who's only weakness is the writing of McCall.
The opening is brilliant. Suspicious wife follows husband to motel and stumbles onto a murder. She runs to her cop ex-boyfriend and he quickly wonders whether the murderer could - in fact - be the husband, and pursues the investigation from that angle.
The episode doesn't openly declare the identity of the killer until near the end, but it's pretty clear who it's probably gonna be. Had Hunter not voiced this option out-loud during the episode, I would have been disappointed and bored by the episode. We viewers want our TV detectives to be as smart as us. And if we're at home thinking "it's probably the husband", we don't want our heroes stumbling around with no idea what is going on. Particularly when there are no other suspects!!
Tragically, Jeff Wilheim chooses to write McCall in exactly this fashion. She resists Hunter's deductions at every turn, ascribing them to jealousy. There's no real reason for this, and it serves no function within the story. It is very annoying, though.
Anyway, the episode runs through a turn or two before the hugely enjoyable climax. The bad-guy is rumbled, takes his wife hostage and leads Hunter & McCall on a superb car chase ending in an incredibly cool shoot-out which truly elevates Hunter to "Super Cop" status as he eyes down the murderer, walks out to face him and calmly blows him away with one shot before walking back to his car and calling the coroner. Ouch. I half expected McCall to say: "Wow."