Later Weise was found to have posted numerous online comments expressing his frustration with living in Red Lake, and feelings that his life was beyond his control.

He described the reservation "as a place where people 'choose alcohol over friendship,' where women neglect 'their own flesh and blood' for relationships with men, where he could not escape 'the grave I'm continually digging for myself'." "I had went through a lot of things in my life that had driven me to a darker path than most choose to take.

On March 5, 1999, when Jeff was ten, his mother was in a car accident, in which a tractor-trailer crashed into the car that her cousin was driving. The cousin died in the accident and Joanne suffered severe brain damage.

Following his mother's accident, Jeff was placed in the custody and care of his paternal grandmother, on the Red Lake reservation.

With a .22 caliber pistol that he had acquired up to a year before the shooting, Weise first killed his grandfather, 58 year old Daryl Lussier Sr.

while he was asleep in bed and his grandfather's girlfriend, 32 year old Michelle Sigana while she was coming back upstairs from the basement with laundry.

He later claimed in online postings that his mother was alcoholic and had physically and emotionally abused him.

His grandfather, Daryl "Dash" Lussier, Sr., a sergeant in the tribal police force, had tried to intervene but was unable to bring about a peaceful end.Weise chose to stay with his grandmother rather than rejoin his mother and move again.Due to his disrupted family life, Weise attended numerous schools as a boy: Pearson Elementary School in Shakopee, Minnesota from kindergarten to fourth grade, Bluff Creek Elementary School in Chanhassen, Minnesota for fifth grade, and Red Lake Middle School for sixth through eighth grades.He killed his grandfather and his grandfather's companion before going to the reservation high school, where he murdered seven more people and wounded five others.He committed suicide before being captured by unmarried Ojibwe couple from the Red Lake Indian Reservation in Red Lake, Minnesota.