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 Chester Heights, state police say.

A U.S. Border Patrol agent was fatally shot Monday afternoon in Vermont, state police said. Federal authorities are investigating.

According to reports, there were no injuries in the incident near Fronton Island, an uninhabited island in Starr County, Texas.

The FBI says the woman and a German man who died in the firefight had been under surveillance for several days.

Teresa Youngblut, 21, faces federal firearms charges in the Jan. 20 death of U.S. Border Patrol Agent David Maland, and police and court records have shed some light on connections to killings in othe

The gun used in the shooting death of a Delaware County couple was used in connection with the line-of-duty shooting death of a border patrol agent in Vermont, officials said.

The woman, Teresa Youngblut, 21, of Washington state, faces two weapons charges in connection with the Jan. 20 death of 44-year-old Border Patrol Agent David Maland.