What can you write about a serial killer?

I'm considering developing my first feature length project around a serial killer known in my country during the '70s. The guy's still alive and doing his time in prison, though he's been asking for parole as of late.
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Anyhow, before I dove into the writing process something stopped me, a question I should have asked perhaps as soon as the subject caught my attention: legally speaking, how much am I allowed to cover in a script if it revolves around real life events?
Everything printed out on newspapers -therefore considered news/public information- should be fair game, right? But what about the personal stuff I've gotten my hands on like little bits about his childhood -gathered from interviews he's given over the years to magazines and the likes-, or memories from the murders collected from books which have been written about him?
Basically, how much can I write without infringing any copyrights or without having to ask for permission? Or how does one go about doing a film like I Love You Phillip Morris (which, from the top of my head, is a somewhat close example of what I'm trying to create here, though I wouldn't be adapting any novels)?
 
You can never prevent a lawsuit, but it doesn't mean you'll lose.

You're pretty safe though as long as you change the names.* In example, look at Primary Colors.


*I'm not a lawyer.
 
Yes, I'm thinking the same thing. I'll try getting a hold of a lawyer before seeking fundings though, just to be as safe as possible.
Thanks for the reply!
 
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