A 23-year-old man has been charged with second-degree murder after a shooting Saturday night at a country club in Nashua where one person was killed and several other people were injured. The Attorney General’s Office says Hunter Nadeau of Nashua, allegedly shot and killed 59-year-old Robert DeCesare in an attack at the Sky Meadow Country Club. Investigators said Nadeau shot and wounded two other people, including one who worked at the restaurant and one who was a patron. Meanwhile, at least four other people suffered other non-gunshot injuries as they tried to flee. There is no known connection between the victim and the shooter other than that Nadeau previously worked at Sky Meadow for about a year. Nadeau is scheduled to be arraigned this afternoon.