As far as I know there is no state where suicide is crime. An attempt may result in commitment to a mental health facility but in itself is not a criminal act. If he lived the girl could still be charged with a crime while he would be untouchable. If he commits no crime then what crime can she commit? If she commits a crime then he must commit a crime too! How is the law applied equally? Although easy to dismiss because it is self inflicted that is not a compelling reason for someone indirectly active in a “crime” is the only party accountable or punished? More importantly, he had been suicidal in the past but no one has indicated he was under care. If he wasn’t his parents must have some responsibility for his death. He was not old enough to legally procure his own medical treatment and it is unlikely he was mature enough to consider treatment. His parents were key to this situation. If he was untreated his state of mind was responsible for being in a dangerous situation in the first place. Medical care is never guaranteed resolution but it is better than the obvious alternate.