Detective Nathaniel Kim appeared in the episode Red Dawn. He was the killer of Winston Dellinger.
There was a fight in his bar. Everything was invested in the bar, and he couldn't risk it being closed, since he has been sued. It was also about that time that he got the Dellinger case. Dellinger's father was the judge handling the lawsuit, so he went to the judge and made a deal: he would hide evidence that Winston was the murderer in a hit and run, if the judge would rule in favor of the bar in the lawsuit. The judge agreed.
But then he got a call during the night from Winston. He was drunk and thought he hit someone with his car again. Kim, a police officer, asked him to own up to his crimes, but Winston threatened that if he did not help, he would reveal everything about the deal. So Kim left his home, meeting him to find the body. But there was none. Kim knew that was his chance so he shot and killed him. It was subsequently revealed that Winston hit a deer and not a person.