Yup, "Perry Mason". It's on METV twice a day, and I have the whole series on cd., Of course, I know who killed the guy. But there's something about the show where it's like watching it the first time., all over again. And there are scenes , which indicate how old the show is. Like putting a nickel in a phone booth to make a call. Or having a breakfast of coffee, eggs and toast, AND getting change back from a 50 cent coin. But the stories hold up. We want to kill the same bastards, way back in the 50s, as we do now. And quite frankly, all detective/ court room shows trace their roots back to PM.
BTW. There is one PM scene that always cracks me up. Perry and Della are having dinner at a very exclusive hoity toity French restaurant. And they just could not believe that it charged $1 for a cup of coffee. It was a running gag through the episode- what was so great about a cup of coffee that it cost the unheard of price of $1? ( a cup went for 5/10 cents at the time).
Definitely pre-Starbucks.