The victim was reportedly shot at least five times at the scene and was pronounced dead by police. Amber Rose's husband was still on stage performing at the time.
An eyewitness said they saw the gunman and victim arguing in a dark hallway backstage before the incident occurred. Cops don't believe the two men had any connection to the rapper and tell Us that they are still looking to identify the suspect of the shooting.
Khalifa kicked off his 2014 Under The Influence Of Music Tour in July. He's currently promoting his fifth studio album, Blacc Hollywood.
More details to come.