Hi, and Welcome to Websleuths!
I am a longtime member and former administrator/moderator, now retired from those duties.
As a new member, it would be a good idea to familiarize yourself with the Terms of Service, aka The Rules, that we all agreed to when we joined. Websleuths is fact-based and victim-friendly. Because of those standards, it is recognized as the gold standard among true crime discussion forums. The Rules are linked in my signature below.
If you have any questions about the Rules, please click the REPORT link at the bottom of every post. The moderators will then get your message, and they can best address the answers you seek about how things work here.
Regarding the murder confession you asked about, you could do some preliminary general online first by searching with the few details you have. That may give you some answers of what crime it might match.
Then you could search Websleuths with more exact details to see if there is a discussion thread about the crime.
Websleuths requires that any thread started about a specific crime must include a link to a mainstream media news source that is about the crime OR a link to an official law enforcement source about it.
Hope that helps.
We’re glad you joined us!
CocoChanel