SACRAMENTO, Calif. — Five people were shot, one of whom was killed, early Monday in downtown Sacramento, police say — the second mass shooting in the city’s core in three months. Sacramento Police Chief Kathy Lester said the shooting took place outside the Mix Downtown nightclub at 16th and L streets as the club was closing down. “What we know now is very limited and we hope to share more as this investigation continues,” Lester said. “Ultimately, we had five people who were shot as a nightclub was letting out in our area. “Of the five, one is unfortunately deceased, and the other four are bei…