Still nobody knows who killed Tupac but there have been a few people linked with the shooting but none of them was found guilty and the mystery has not yet been solved. Here are a list of people who may have killed Tupac.
Suge Knight
In the intro of Don Kiluminatri Kadafi it says "Suge shot him." Suge Knight told Tupac that it was a hot day and told him to take his bullet proof vest off. Tupac always wore it so why would Suge want Tupac to take off his bullet proof vest off? Suge Knight wouldn't talk to the police and said he wouldn't tell them if he knew. A person called Kafida of the outlaws saw who killed Tupac, was going to tell the police but was killed a month later.
Crisps
A medallion was stolen from a death row member and the robber was allegedly was Orlando Anderson. Three months later Tupac and Suge Knight saw him in Las Vegas and attacked him. Later Orlando and the crisps were looking for Tupac. Later a car pulled up next to Tupac and started opening fire. Orlando Anderson was later arrested.
Mobb Deep
Mobb Deep and Tupac dissed each other on records Mobb Deep were in California when Tupac was shot. These lyrics are from a mobb depp song. "You tried to test my patients but I got something for ya I crepped on ya weakness and came to California. My  crew loaded nines screamin now it's past your time. On the border where we stood anxiously waiting ritious crooks. H slammed the door on the caddy blase the blunt and load the daddy drove past your fu*kin sign. What was yours suddenly became mine. Shattered the windows with a nine, killing bitches is a must, not a crime."
Black mafia
Black Mafia was angry that Tupac wouldn't sign to Bad boy.