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

Here are four new details emerging in the bizarre and tragic shooting of U.S. Border Patrol Agent David "Chris" Maland in Vermont on Inauguration Day, including the killers' link to a "violent transgender commune.

David C. Maland was conducting the traffic stop​ on Interstate 91, about 20 miles from the Canadian border when "an exchange of gunfire occurred," FBI said.