The case doesn't name Diddy as a defendant, but repeatedly claims that new evidence — and old song lyrics — tie him to the long-unsolved murder. Tupac Shakur poses for photos backstage after his performance at the Regal Theater in Chicago, Illinois in March 1994. Raymond Boyd/Getty Images Trending on Billboard Tupac Shakur ’s family has filed a wrongful death lawsuit over the rapper’s 1996 murder, claiming Netflix’s recent Sean “ Diddy ” Combs documentary lends support to theories that Diddy was “involved in Tupac’s murder.” The civil case, filed Tuesday (April 28) and obtained by Billboard , was only filed against Duane “Keffe D” Davis, who will stand trial in August over Tupac’s long-unsolved murder. But it also targets an unspecified number of “John Doe” defendants whom the family hopes to identify as the case moves ahead.…