In my opinion Murray is now trying to build his defense on 'Michael was a drug addict' statement, however this statement doesn’t help him. No matter if Michael was or wasn't addicted and demanding medication:
1. This was a doctor-patient relation and Murray is the one who was paid for being professional, not Michael,
2. he gave his patient very dangerous mix of different drugs,
3. as professional – he is expected to have a specialized knowledge: in other words he should know which medicines he can mix and which he can't and what effects this can have on his patient,
4. he left alone his patient after giving him this dangerous cocktail,
5. there was no required medical equipment in the room, nothing that would help him monitor his patient,
6. and on the top of all - he was paid really well for his job and always had a choice to resign in case he didn't like it...
Therefore, the only one conclusion can be made: any doctor who does things Mr. Murray did is guilty and should be convicted.