The weapon that killed Agent David Maland last week in northern Vermont was bought by a person of interest in a double murder two years ago in Delaware County, state police say.

As the sprawling investigation unfolds, here’s an overview of the key figures involved and their alleged connections.

Michelle J. Zajko, 32, allegedly gave guns to pair accused in Border Patrol agent's shooting death. She's a 'person of interest' in her parents' 2023 murder.