Andrew Kornfeld was in Minneapolis on behalf of his father, a California-based addiction specialist.
Prince accidentally overdosed on the painkiller Fentanyl, according to his official autopsy.
The powerful drug fentanyl was found in the singer's system.
Painkillers had been the focus of an investigation after the singer was found dead at his home April 21.
Police say tests show the music icon's unexpected death was due to a drug overdose.
Despite her critics, the pop star was pleased with her Prince tribute at the BBMAs.
The pop star responds to those criticizing her Sunday performance.
From heartfelt, tearful performances to unusual wardrobe choices, here are some of the stand-out moments from this year's BBMAs.
'You can't control everything.'
After Madonna (and Stevie Wonder)'s memorial to the music icon, the BET Awards came out swinging with an ad for its own upcoming tribute.
The pop diva sang "Nothing Compares 2U" and "Purple Rain" during the Billboard Music Awards.
Two possible relatives of the music legend have come forward.
On Sunday, the late singer was remembered by his religious congregation in a touching memorial service.
Though the music legend was cremated, he was formally laid to rest near his hometown on Sunday.
