I can't remember any of the names, but it seems like there was a case sometime between seasons 5-7 or so where a guy in a hood went into a convenience store, a pizza place, and a couple of others and shot people execution style. I think there were six murders altogether. I don't remember the names or exactly where in the country the murders occurred. But I do remember a Robert Stack quote, "Six people are dead because of a man's pathological need to kill."

And I do know the killer was caught cause I remember the update, but I can't remember his name, if he was convicted, or what the motive was.

I know it sounds like I-70 killer but its not, this one was different, anyone remember it? I haven't been able to find the episode.

https://unsolvedmysteries.fandom.com/wiki/Pizza_Parlor_Killer

Yep, that’s about 3 miles from where I currently live.