THAT particular combo is deadly. About the only thing he was missing was lorzeapam/Ativan. Closely related to diazapam/Valium.

Most doctors wil ASK what you already are taking.....did they? They may well have. Maybe he lied, or just didn't say. Maybe HE didn't know, lots of people don't. We'll never know.

And we'll never know if it was on purpose or an accident. I know many, many people who have multiple doctors on their 'string' and don't/won't/refuse to tell them what else they have scripts for. They also use different pharmacies/chemists for each doctor.

It's actually pretty easy to do if you want to.
As I said, we'll never know. His family can believe whatever brings some peace to them. Blessings on them all.