Family members of murder defendant Isaiah Rivera-Perez and shooting victim Jaiden Connor filled nearly every seat in a Hillsborough County Superior Court hearing room Tuesday morning as a trial opened that will hinge on the state’s self-defense law. Homicide prosecutor Nicholas Chong Yen showed the jury a home security video that captures Connor, 17, running down Central Street and collapsing, where police found him with a bullet hole in his back. “He shot Jaden Connor in the back. He shot Jaden Connor while Jaden was running away from him,” said Chong Yen, an assistant New Hampshire attorney general. “That is...