SAN JUAN, Puerto Rico (AP) — The man being sought in the killing of three police officers is the person recently found shot to death with a cardboard sign on his chest declaring him guilty, Puerto Rican authorities announced Wednesday. Officials said they did not yet know who fatally shot the suspect, identified as 25-year-old David Rivera Bitiz. They said his death was being investigated as a possible street justice killing. “Police don’t have anything to do with the murder of this individual,” Lt. Col. Rolando Trinidad said in response to questions during a news conference. The suspect’s body was found near a sprawling public housing complex in the popular tourist district of Isla Verde that authorities had been combing since the three officers were killed Monday.