CAZENOVIA, Wis. — A teenager brought two weapons from his family’s gun cabinet to his rural school yesterday and fatally shot the principal after a struggle with adults and other students, authorities said.

Eric Hainstock, 15, was taken into custody and charged as an adult with murder, the district attorney said. No one else was hurt.

Authorities said Hainstock had complained about being teased by other students and decided to confront teachers and the principal. The shooting also came one day after the principal gave him a disciplinary warning for having tobacco, according to a criminal complaint.

Witnesses said Hainstock walked in with a shotgun before classes began. A custodian, teachers and students wrestled with him, but he broke free, took out a handgun and shot Weston High School Principal John Klang three times, Stammen said.

The custodian said Hainstock was a special-education student who told him he was there to kill someone but did not say who.

"He was calm, but he was on a mission," said Dave Thompson, 43, who also has two children at the school.

Sophomore Shelly Rupp, 16, described Hainstock as a freshman with few friends and said he was "just weird in the head."

"He always used to kid around about bringing things to school and hurting kids," she said at a gas station nearby where students and townspeople had gathered.

Thompson said Hainstock first pointed a shotgun in a teacher’s face. Thompson grabbed away the gun, but Hainstock then appeared to reach for another gun, so Thompson and the teacher took cover.

Thompson then ran into a kitchen to call 911.

Junior Timmy Donovan said Hainstock "pulled a .22 pistol out of his pants, and then started shooting the principal. And at that point, I guess the principal ran and tackled him to the ground."

Klang, 49, was shot in the head, chest and leg, authorities said. He died hours later at a hospital in Madison.

Hainstock, could get life in prison if he’s convicted, District Attorney Patricia Barrett said.

Wisconsin does not have the death penalty.

Children from pre-kindergarten through 12 th grade attend the small school near Cazenovia, a community of about 300 people about 60 miles northwest of Madison.

Laurie Rhea, 42, said the principal spent last weekend at the gas station washing cars for a homecoming fundraiser.

"All the kids just loved him," she said.

The shooting happened as the school was preparing for homecoming weekend. The homecoming parade, football game and dance were canceled or postponed.