FILE &#8211; In this Feb. 4, 2007, file photo, Prince performs during the halftime show at the Super Bowl XLI football game in Miami. Nearly a year after Prince died from an accidental drug overdose in his suburban Minneapolis studio and estate, investigators still haven&#8217;t interviewed a key associate nor asked a grand jury to investigate potential criminal charges, according to an official with knowledge of the investigation. (AP Photo/Chris O&#8217;Meara, File)