On the morning of August 3, 2022, 25-year-old Kassandra Sweeney was at home in Northfield, New Hampshire, sending videos of her two young sons to her husband. Minutes later investigators found Kassandra and her children, four-year-old Benjamin and 23-month-old Mason, each fatally shot in the family’s Wethersfield Drive residence. Autopsies determined each victim died of a single gunshot wound to the head and ruled the deaths homicides.

Police response followed a 911 call from Kassandra’s husband, Sean Sweeney, after he was told by his brother that someone had broken in and killed the family. Investigators soon focused on a household member, Sean’s 16-year-old brother, Eric Sweeney, who was arrested. He originally told authorities he had fled after hearing a disturbance, and prosecutors later indicted him on three counts of first-degree murder and one count of falsifying physical evidence for attempting to dispose of the handgun used in the killings. Reports say he subsequently pleaded guilty to three counts of second-degree murder and falsifying evidence; weeks before the killings Sean had reported concerns about Eric’s behavior and weapons in the home.

Did anyone in the Northfield area know the Sweeney family or have information about what happened that morning?