Diane Opper, 56, was shot multiple times in her home on Daniel Shays Highway in Belchertown, Massachusetts, on the evening of Friday, March 27, 2026. Emergency responders transported her to Baystate Medical Center in Springfield, where she was pronounced dead. Her husband, Mark Opper, 56, called 911 and initially said his gun had accidentally discharged.

Police found multiple bullet casings and several firearms in the residence and observed blood on Mark Opper’s hands and pants. He was arrested and arraigned on Monday, March 31, 2026, in Eastern Hampshire District Court on charges of murder and assault and battery on a family or household member; he pleaded not guilty. Prosecutors cited allegations of domestic abuse in the affidavit, and a judge ordered him held without bail. A court date was set for April 27, 2026.

Did anyone in Belchertown know Diane or have information about her household or the evening of March 27, 2026?