The FBI has concluded that one man acted alone in killing four people in New Town nearly one year ago.
In a final report on the killings issued today, the FBI says 22-year-old Kalcie Eagle used a hunting rifle to kill Martha Johnson and three of her grandchildren: Benjamin Schuster, Luke Schuster, and Julie Schuster.
All three of the children attended school at New Town elementary and middle schools.
One of the other Schuster children was home at the time of the attack and survived to call for help.
The murders happened in November at the Johnson home, just a couple of blocks from the New Town School.
The FBI investigation concluded that Kalcie Eagle made statements to witnesses, admitting the killings, before traveling to Parshall where, as he was surrounded by law enforcement officers, he slit his own throat and died.
The FBI reports toxicology tests show Eagle was on meth at the time.
An FBI official says there is no indication of a motive for the crimes.