Teresa Youngblut, the woman charged in the shooting death of U.S. Border Patrol Agent David "Chris" Maland, has a detention hearing on Jan. 30.

Associates of woman in Border Patrol agent's shooting death tied to other homicides in Pennsylvania and California.

A United States Border Agent was shot and killed during a traffic stop in Vermont near the Northern border, Fox News has confirmed.

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

The U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives sent an alert to federally licensed firearms dealers a day after the shooting seeking information related to any gun purchases by Michelle Jacqueline Zajko.

A woman has been arrested in connection with the fatal shooting of US Border Patrol agent earlier this week on a highway in Vermont close to the US-Canadian border, the FBI office in Albany said Friday.

A criminal complaint filed in federal court accuses Teresa Youngblut of assault as Agent David Maland's casket brought to Colonie for flight home to Minnesota.

A United States Border Patrol agent was gunned down during a traffic stop in Vermont near the Canadian border, officials have confirmed. It happened around 3:15 p.m. Monday on Interstate 91 in Coventry, 20 miles from the Northern border, according to the Department of Homeland Security.

The FBI said Friday that it arrested a Washington state woman in the fatal shooting of a U.S. Border Patrol agent in Vermont this week and identified the German man who was killed.

The woman accused of killing U.S. Border Agent David Maland allegedly used a gun bought by someone who was a person of interest in a double murder, prosecutors said.

COVENTRY, Vt. (TNND) — A 21-year-old Washington state woman has been arrested in connection to the fatal shooting of a U.S. Border Patrol agent in Vermont, according to the FBI. Teresa Youngblut was charged with assault on a federal law enforcement officer in Monday's killing of 44-year-old David "Chris" Maland.

Federal prosecutors said in a court filing that the investigation into a Border Patrol agent's shooting death has revealed a connection to Delaware County, Pa.