Teresa Youngblut, 21, was indicted on two counts in connection to the death of Border Patrol Agent David Maland, 44, who was killed in a shootout on Interstate 91 in Coventry, Vt., near the Canadian border.

The FBI has acknowledged connections with other deaths but has not yet publicly discussed the broader investigation.

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

The woman charged in connection to the killing of a United States Border Patrol Agent in northern Vermont has now been indicted by a federal grand jury.