Here is that Golgo 13/CSI crossover you requested.
When quarterback Lionel Blue is assassinated on the field of play, a detective and a CSI team clash over how to investigate the murder.
Another episode involving the authorities who have to pick up the pieces after Golgo has done his job. The CSI team in this episode are trying to prove Golgo 13 was the murderer, but the detective realises that Golgo is only the weapon, the real murderer is whoever hired him.
There’s also a false nostalgia at work here, that only really comes to the fore if you look at Golgo 13 as a whole. The detective wonders if the times have changed so much that the world has created a man like Golgo, when of course Golgo has been with us 40 years and when you take into account his “origin”, even longer. Golgo isn’t a creation of modern times, he’s a timeless entity of amoral stoicism.