@OldAle1: Have you seen
this book? Patricia Cornwell "solves" the case of Jack the Ripper. It's reasonably convincing to a layperson, but I'm not as interested in Jack the Ripper, so I never delved deeper beyond that. Interesting read and explication of cold case forensic techniques, if nothing else.
@mighty: In response to your question, yes - love True Crime. And if you liked Mommy Dead and Dearest, check out the rest of Erin Lee Carr's stuff - she's tackling tough true-crime cases in a very interesting and nuanced way.
And for a more general response...
I love this stuff. I've always been interested in it. My parents were into it, which is probably why I am as well (seriously... don't show your kids the Unsolved Mysteries episode that took place in your hometown). And a bit like OldAle, a lot of my interest stems from home. Green River Killer and Ted Bundy were from WA, and there was a slightly less prolific serial killer from my hometown. Plus, it seemed like every single time I turned on a random COPS episode or random TV doc about a crime while in grad school, it was set in good ol' Spokane, WA.
More recently, I've been really digging watching docs/docuseries on crimes where I remember the media coverage. Because I remember the case from the impressions left to me by the media, I find it fascinating to dig into the story and learn more about what happens.
OJ: Made in America might be the best example I've seen of that,
Conversations with a Killer,
Lorena,
The Murder of Laci Peterson,
30 for 30: Fantastic Lies,
Beware the Slenderman,
Amanda Knox, and
Waco: Rules of Engagement are some of the better ones I've seen. Even shittier ones like about Casey Anthony or Chandra Levy or Madeleine McAnne are interesting to me.
Side note and trigger warning and, well, spoiler:
I generally consider 30 for 30: Fantastic Lies to be a spiritual sequel to The Staircase. Fantastic Lies is about the Duke Lacrosse Rape case, where many players on the lacrosse team were accused of rape of a stripper they invited to their frat. Long story short, the case entirely fell apart under scrutiny, but the lead prosecutor here was one of the prosecutors on the Staircase case. And every prosecutorial misconduct accusation that was levied during Staircase was proven in Fantastic Lies so completely that the prosecutor went to prison and was disbarred.
I do like white collar crime stuff, too, if done well, but mostly because I don't understand it and aspire to be rich enough one day that white collar crime would be reasonably lucrative for me.
Abacus: Small Enough to Jail was a nice doc about what the banks were doing in the 2008 financial crisis and
Dirty Money is a great Netflix docuseries about financial crimes. Really, I like these because I learn about new crimes I didn't know much about.
Others that I've seen that are at least softly recommended:
Tiger King. The popularity is WAY overblown and the central mystery isn't all that great, but if you can ignore the hype, it's an entertaining look at animal crimes. At least the first 6 episodes are interesting. The last two wrap things up and are anticlimactic.
I Love You, Now Die. Another Erin Lee Carr film about the girl who was arrested for texting her boyfriend to kill himself.
The Trials of Gabriel Fernandez. A lighthearted doc about horrific child abuse and murder. Not only the crime, but the systems in place that allow it to happen.
Who Killed Malcolm X? A much better experience if you're into the history of the civil rights movement (mostly in the US).
Killer Inside: The Mind of Aaron Hernandez. The intersection of football, head trauma, and a normal murder.
Time: The Kalief Browder Story. More on the social justice than the crime itself, about a kid kept in jail because he couldn't make bail after being arrested for snatching a purse.
The Golden State Killer: It's Not Over. Probably the worst-timed unsolved crime doc you'll see, about an unsolved serial rape/murder killer from California. Solved just a couple months after this doc came out.
Don't F**k with Cats. Just don't. The internet will hunt you down.
Evil Genius. As a doc, it's so-so, but this is probably the most bizarre case I've ever seen. So screwy.
The Keepers. A nun is murdered... might the Church cover something up?!?
Tower. Doc is more interesting than the crime, but holy hell is it an amazing film.
Dear Zachary. Obviously.
Leaving Neverland. Michael Jackson liked to stare at kids' buttholes? Dave Chappelle spoiled that one...
At the Heart of Gold. The Larry Nassar gymnastics abuse case. Has a very satisfying ending.
The Central Park Five. Again, more about the broken US criminal justice system, but damn...