AG: Juvenile Arrested in Murders of Northfield Mom and 2 Young Sons

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Northfield homicide victims Kassandra Sweeney, age 25, and her two sons Benjamin Sweeney, age 4, and Mason Sweeney, age 1 are pictured with husband and father Sean Sweeney in this GoFundMe page photo.

Update: At a brief news conference at 4:30 p.m. Thursday, Senior Assistant Attorney General Geoffrey Ward said the law allows for prosecutors to petition the court to certify the juvenile as an adult at which time the proceeding would be public. Ward wouldn’t say if the state plans to file such a petition. Ward wouldn’t release the age of the juvenile.

Attorney General John M. Formella, State Police Colonel Nathan Noyes, and Northfield Police Chief John Raffaelly announce that an arrest has been made in connection with the triple homicide in Northfield.

A juvenile has been arrested and charged under the juvenile laws with three counts of first-degree murder and one count of falsifying physical evidence in connection with the homicides of Kassandra Sweeney, age 25, and her two sons Benjamin Sweeney, age 4, and Mason Sweeney, age 1, in Northfield on August 3, 2022.

As previously reported, the investigation to date has revealed that on August 3, 2022, at approximately 11:33 a.m., law enforcement officers arrived at 56 Wethersfield Drive in Northfield, New Hampshire in response to a 911 call for service.  Upon their arrival, officers located the three deceased individuals inside the residence.

Autopsies were conducted by Chief Medical Examiner Dr. Jennie V. Duval.  Dr. Duval determined that the cause of Ms. Sweeney’s death was a single gunshot wound, and the manner of her death was homicide.  In addition, Dr. Duval determined that the cause of Benjamin’s death was a single gunshot wound, and the manner of his death was homicide.  Dr. Duval also determined that the cause of Mason’s death was a single gunshot wound, and the manner of his death was homicide.

Since the alleged perpetrator is a juvenile, the law precludes any further information from being released.  See RSA 169-B:36, I (“It shall be unlawful for any person to disclose court records or any part thereof to persons other than those persons entitled to access under RSA 169-B:35, except by court order.  Any person who knowingly violates this provision shall be guilty of a misdemeanor.”).

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