No Tupac was actually killed over silly shit. Basically Pac was connected with the Bloods via Suge. Anyway some crips ended up rolling on a Death Row guy and stole his chain at a mall. Weeks later Pac was in vegas for the Tyson fight. He and his buddy who got the chain snatched saw one of the guys that did it. He was Orlando Anderson. They went and started to beat him up in the MGM lobby(that is what is on tape) Anyway, Anderson didn't press any charges and then caught up with Pac later which wasn't too hard to do considering the type of cars in a line on the strip. So they dumped on him and bam, end of story.
The Biggie shit is a bit more complicated but there is a connection with a former corrupt cop who looks very similar to the sketch they put out. Anyway he did private security for Death Row. Most likely Suge ordered it because Biggie was basically shitting on their faces by coming to LA and flaunting months after Pac was killed and after shit went down between the 2 camps. Orlando Anderson ended up being shot to death like a year later.