To clarify, I'm not suggesting OpenAI was involved, or that the cause of death is anything other than suicide. I was pointing out an investigative detail (legal ownership of the weapon). I have now read 4 or 5 articles on the matter and none have mentioned this detail.
If he did legally own the weapon, it would be difficult to prove suicide isn't the cause of death without additional evidence of another person being present.
If he didn't obtain the weapon legally, that warrants an additional investigation into how he obtained the weapon (his parents' request). While it doesn't eliminate suicide as a cause of death, it is a key detail in the case.