One theory that has been popular is that it was in retaliation to the murder of Los Angeles rapper Tupac Shakur.
Montebello police Chief Kevin McClure, who used to head the LAPD robbery-homicide division for years, said there were constantly pieces linking Shakur and Biggie Smalls together. But he also said the case is complex.
He went on to say the actual shooter may not even be alive, based on evidence gathered in the case.
Many fans and celebrities posted tributes to Smalls on social media.