The killings of a Border Patrol agent in Vermont last week, a state’s witness in California, and a pair of senior citizens in Pennsylvania all appear to be linked to a fringe group of West Coast vegan activists and artificial intelligence theorists.

Less than a week after a woman from Seattle was charged in connection to the fatal shooting of a U.S. border patrol agent in Vermont, a man from Seattle was arrested and charged with murder in Northern California — and it appears the two arrests are related.

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.

Maximilian Snyder, who has been charged with killing a California landlord, applied for a marriage license last year with Teresa Youngblut, who has been charged in connection with the fatal shooting last week of a border patrol agent in Vermont.

Prosecutors are arguing why a Washington state woman should remain jailed in connection with the death of a U.S. Border Patrol agent

The California suspect was listed on a marriage application with a woman accused of killing a Border Patrol agent. They attended Seattle's Lakeside School.

A man accused of murder in California appears to have sought a marriage license with a woman charged in connection with the fatal shooting of a U.S. Border Patrol agent in Vermont.

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.

Teresa Youngblut was ordered held without bail in connection with the death of U.S. Border Patrol agent David Maland in a case that has grown to encompass killings in multiple states.

Federal prosecutors say a Washington state woman charged in connection with the fatal shooting of U.S. border patrol agent in Vermont had been in frequent contact with someone whom authorities have linked to homicides in Pennsylvania and California.

The recent murder of an 82-year-old Vallejo man may be connected to the murder of a border patrol agent in Vermont and a double homicide in Pennsylvania.

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.