The murder of Wallace took place six months after the shooting of Tupac Shakur, whose death has also remained unsolved for almost 25 years.
City of Lies was initially meant to be released in the US in September 2018, but was pulled by the distributor.
For over two decades the murder of rap star The Notorious B.I.G. has been the subject of many theories and questions but very little by way of answers as to who was responsible for his untimely death.
Muhammad is reportedly now once again known as Billups, and is currently thought to be working in Georgia as a realtor.