David Atherton, 24, was shot dead inside his Congress Street home in Stoneham, Massachusetts, late on June 28, 2016. Atherton had recently joined the Stoneham Fire Department and served in the Massachusetts Army National Guard. The shooting occurred at about 11:10 p.m. after an evening of drinking and socializing with friends.

A single bullet struck Atherton in the chest and he was pronounced dead at the scene. A third man was also present in the home. Riccardi-O’Connor initially told 911 that Atherton had shot himself, but video taken that night contradicted that claim and investigators say Riccardi-O’Connor later admitted he pulled the trigger, not believing the gun was loaded. The firearm was owned by Riccardi-O’Connor and his carry license was revoked.

Riccardi-O’Connor was arrested and arraigned on charges including involuntary manslaughter, assault and battery with a dangerous weapon, and discharging a firearm; he was released on bail with conditions including GPS monitoring. Does anyone have information about the evening leading up to the shooting or remember seeing the men that night?