Slain rapper Notorious B.I.G.'s murder may be one of the Los Angeles Police Department's highest profile cold cases.

After an autopsy report was unsealed and released Friday, the entertainer's lawyer says a former police detective has told him the case was solved years ago. Perry Sanders Jr. says a current member of the police force has also confirmed it, according to the Associated Press.

Notorious B.I.G.'s real name was Christopher Wallace. He was killed in a drive-by shooting 15 years ago after attending an Soul Train Awards after party hosted by Vibe magazine. The autopsy says he was killed by a single bullet that pierced several vital organs.

Los Angeles police spokesman Richard French declined to comment, saying the killing of Notorious B.I.G. remains an open investigation.

Sanders has sued the city over its investigation of the 24-year-old's rapper's shooting death.