Juvenile charged with first-degree murder in deaths of Northfield woman and her 2 sons

  • Police responding to a 911 call late Wednesday morning found the bodies of 25-year-old Kassandra Sweeney, and her two sons Benjamin Sweeney, age 4, and Mason Sweeney, age 1. Autopsies revealed that each died of a single gunshot wound, and the deaths have been declared homicides.

Staff and wire reports
Published: 8/11/2022 4:51:56 PM

A juvenile has been arrested in the shooting deaths of a mother and her two sons, who were found dead in their Northfield home last week, the New Hampshire attorney general’s office announced Thursday.

The minor has been charged under juvenile laws with three counts of first-degree murder and one count of falsifying physical evidence in connection with the homicides of a 25-year-old Kassandra Sweeney and her sons, Benjamin, 4, and Mason, 1. Each died of a single gunshot wound, authorities said.

Kassandra grew up in Northwood and graduated from Coe Brown Academy. Her family said Kassandra was born to be a wife and a mother.

“She spent every available moment making family memories whether it was with her husband and sons, at her parents’ house, with her sister, or with extended family,” her obituary said. “Kass spent many hours playing in the yard with her boys, sharing meals, decorating and celebrating holidays (especially Christmas with her family), and spreading love.”

Benjamin loved singing “Puff the Magic Dragon” and cooking with his mother, according to his obituary.

“He was a lover of learning whether it numbers, letters, animals or nature,” his obituary said. “Benjamin enjoyed making memories with his family and extended family.”

Mason, who would have turned 2-years-old this month, was just building his first memories.

“Mason loved cuddling with his family, dancing to The Beach Boys ‘Barbara Ann’ and ‘Baby Shark,’ ” his obituary said.

Kassandra’s husband, Sean Sweeney, was cooperative with investigators and devastated by the loss of his family, authorities said.

 Law enforcement officers responding to a 911 call found the three bodies inside the residence on Aug. 3. On Wednesday this week, investigators searched the side of Interstate 93 between Exits 17 and 20 for evidence.

Because the suspect is a juvenile, the attorney general’s office said no further information would be released.

Last week, the attorney general’s office said the homicides are not connected to the unsolved double murder of Concord couple Stephen and Wendy Reid. The retired couple was found shot to death on the Broken Ground hiking trails in April. No arrests have been made in that case. 

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