So the story here is that this friend of yours send, at some point, nude pics (some of them when she was minor...) to a guy that he is now dead.
Then all of a sudden, she receives a mail (?) or a FB message (?) to send to this account more pics or else the blackmailer will post the pics that he has already to her job, friends etc surroundings. Am I say it correctly or I miss something?
Correct.. Exactly..
He just sent her a long list of names he is threatening to send them to..
Also.. I guess this has been going on for a long time..
If you have facebook profile image of this guy you can run image search on google/yandex to get information if he is using real photo, but I doubt that.
This is free however so you can try it.
You can also check same image for exif and possible traces.
This is serious stuff, and if police can't help her, she can hire other people to track him.
I am sure he made some mistakes or will make mistakes in communication.
The facebook pic he uses, when searched, turns out to be some actor/model guy..
Name is a spin of a famous gangster/outlaw..
IP is a VPN..
I'll try to get a dump of their entire conversation..