Well, there's a lot of conflicting info on when the ID was made. The three day thing is what I heard first.
The latest seems to be that the police knew who it was almost immediately and used his name in their reports. but, for some reason, he was listed as a John Doe in the morgue, and that, the next morning, when his father called to report him missing, the police came to his house and told him about the shooting.
I've also heard the police got his height and weight from his driver's license and I've heard he wasn't carrying his driver's license.
I've heard the police couldn't find out who he was from his cell because it was locked. I've also heard they just sealed it in an evidence bag without doing anything with it.
It does seem pretty definite, though, that his father was notified the next day. Perhaps he made the actual physical ID that Monday? That would be where the three day rumor started.
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“Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it.†– Richard Feynman