Here’s a look at the timeline of events in a series of killings that culminated in a Jan. 20 highways shootout that killed a Border Patrol officer in Vermont

The killing of U.S. Border Patrol Agent David Maland near the Canadian border last month and five other homicides in Vermont, Pennsylvania and California have been tied to a cultlike group. Interviews and online postings reveal how young computer scientists described by those who know them as highly intelligent appear to have become increasingly violent.

The killing of U.S. Border Patrol Agent David Maland near the Canadian border last month and five other homicides in Vermont, Pennsylvania and California have been tied to a cultlike group

The killing of a U.S. Border Patrol agent near the Canadian border last month has been linked to a cultlike group at the center of five other homicides in three states.