injuring three, before he was shot by police. what we re learning. the horrifying attack in china. several american teachers stabbed in a public park. the suspect in custody. and our exclusive with legendary singer celine dion, speaking out about her rare health battle and her vow to return to the stage. wherever you are announcer: this is nbc nightly news with lester holt. good evening and welcome. tonight, justice is once more taking presidential history into new waters. the first child of a sitting u.s. president has been convicted of a crime. a jury in delaware finding presidential son hunter biden guilty of three federal counts related to his purchase of a gun during a period he was using drugs. hunter biden s addiction struggles are well-known, but addiction, saying the case was really about the special prosecutor david weiss rejecting the idea that the case was just about addiction, saying the case was really about the illegal choices hunter biden made, a