Pierce Boykin , 31 , charged with the murder De'Von Pickett , 29 . Tour manager was stabbed to death outside a Philadelphia bar last month . Comment: Pickett and Parker in the city to rehearse for Minaj 's new European tour .
Pierce Boykin , 31 , charged with the murder De'Von Pickett , 29 . Tour manager was stabbed to death outside a Philadelphia bar last month . Also charged with attempted murder of fellow crew member Eric Parker . Pickett and Parker in the city to rehearse for Minaj 's new European tour .