atlanta concert for health reasons, he spent the day with minnesota doctor michael schulenberg undergoing tests. prince's plane made an emergency landing. the day before prince died, members of prince's inner circle initiated an intervention. getting the help of prominent california addiction doctor, howard kornfeld. unconscious in an elevator at his paisley park home by estate staff and kornfeld's son andrew who had taken a red eye to begin recovery process. kornfeld was carrying opioid addiction treatment pills. the attorney, explained the son's role last month. >> andrew's purpose in being there was to describe the recovery without walls program to familiarize prince with that. prince could go there for pain management and any addiction issues. >> reporter: since prince's death investigators including the drug enforcement agency have focused on the singer's use of the painkillers and how he got them. now, that we know how prince died. authorities will have to determine if criminal...