One suspect, a German national, is dead, and a second suspect, a U.S. citizen, suffered injuries, authorities said.

At a hearing and in court filings, a federal prosecutor in Vermont cited connections between the defendant, Teresa Youngblut, and people linked to other murder investigations.

A Border Patrol agent was shot and killed at a traffic stop in northern Vermont, federal authorities said Monday. Vermont

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

The Department of Homeland Security’s U.S. Customs and Border Protection said in a statement that the agent was killed in the line of duty, although it did not provide details.

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.

A Washington state woman was ordered held without bail Thursday in connection with the death of a U.S. Border Patrol agent in Vermont.

A Washington state woman was ordered held without bail Thursday in connection with the death of a U.S. Border Patrol agent in a case that has grown to encompass killings in multiple states.