Maybe.
I never bothered to watch the movie Zodiac (2007) until a couple of weeks ago.
I was surprised at how much I really liked it.
The “feel” was so good (opposite of the In Cold Blood miniseries dvd which I had to fast forward to get the thing over with).
Some movies have a feel I like, such as Diamonds Are Forever, Live and Let Die and Goldfinger.
Have no idea of the genuine solution to the case. I think the bumbling, corrupt FIB will be the last to know, maybe with an agent falling over a corpse in the dark somewhere.
https://www.rottentomatoes.com/m/zodiac/reviews?intcmp=rt-what-to-know_read-critics-reviews