THE death of the primary suspect in Tupac Shakur’s drive-by shooting left the rapper’s case cold for decades before the high-profile arrest of a Compton street gang leader. Investigators have long suspected Anderson, Davis’ nephew, as the triggerman who opened fire at Shakur from the back seat. They can’t prove it,” Davis told Fox affiliate KVVU. “He felt he was untouchable,” Knight told the outlet. “He wanted to talk bad about ‘Pa, he wanted to just talk, talk, talk, talk.