Greg Kading led multiple law - enforcement task forces investigating the murders and authored the book Murder Rap : The Untold Story of Biggie Smalls & Tupac Shakur Murder Investigations .
Greg Kading will also serve as co-executive producer .
Greg Kading , who will also serve as co-executive producer , led multiple law - enforcement task forces investigating the murders and authored the book Murder Rap : The Untold Story of Biggie Smalls & Tupac Shakur Murder Investigations .