In the quiet town of Belchertown, Massachusetts, the life of 56-year-old Diane Opper was cut tragically short on the evening of Friday, March 27, 2026. A woman known for her vibrant personality and deep love for animals, her death sent ripples of shock and grief through her community. Diane, a dedicated Chief of the Division of Operations & Support for the U.S.
Fish & Wildlife Service for 33 years, was looking forward to her retirement and a new chapter in Florida.
The distressing events unfolded at her residence on Daniel Shays Highway. Authorities were alerted to the tragedy by a 911 call allegedly made by her husband, Mark Opper, also 56. In the call, he reportedly told the dispatcher that his gun had gone off and he had killed his wife. When Belchertown police arrived at the home, they found Mark Opper with what appeared to be blood on his hands and jeans.
Inside the residence, officers discovered Diane on the floor with what seemed to be multiple gunshot wounds to her torso. Emergency services rushed her to a nearby hospital, but her injuries proved fatal, and she was pronounced dead. The Office of the Chief Medical Examiner was tasked with determining the official cause of her death.
In the wake of the fatal shooting, Mark Opper was taken into custody. He was subsequently arraigned in Eastern Hampshire District Court on charges of murder and assault and battery on a family or household member. During the court proceedings, it was revealed that prosecutors raised concerns about a history of domestic abuse. Mark Opper pleaded not guilty to the charges. A judge ordered him to be held without bail, and his case was scheduled to continue on April 27, 2026. The investigation into the circumstances surrounding Diane Opper's death remains active, led by the Belchertown Police Department and the Massachusetts State Police Detective Unit assigned to the Northwestern District Attorney's Office.
