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Prince performs during the halftime show at Super Bowl XLI, Feb. 4, 2007 in Miami. Nearly a year after Prince died from an accidental drug overdose in his suburban Minneapolis studio and estate, investigators still haven'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'Meara)
In this June 1, 2006 photo, drummer Kirk Johnson speaks at a news conference during the first rehearsal by members of the new band The Truth in Minneapolis. Johnson, a longtime drummer for Prince and estate manager at Paisley Park who was among those who discovered the musician's body April 21, 2016, is one of the key figures investigators want to interview in relation to his death. (Jeff Wheeler/Star Tribune via AP)