"Mr. Smith intentionally killed two teenagers in his home in a manner that goes well beyond self-defense," Morrison County Attorney Brian Middendorf said after Smith appeared in court Monday morning. Bail was set at $2 million.
Defense attorney Gregory Larson declined comment.
John Lange, who described himself as Smith's best friend, said Smith shouldn't be in jail.
"You have a right to defend your home," Lange said. "He's been through hell."
But Liberty Nunn, a Little Falls resident who said she knew Nicholas Brady's older sister, said Smith could have simply shouted at them to stop. She said she hopes Smith goes to prison "for a very, very long time."
"Those are two young lives that were taken," she said. "It's just not right."
Minnesota sentencing guidelines call for a range of roughly 21 to 30 years in prison for a person convicted of a single second-degree murder count.
Smith's brother, Bruce Smith, told the Minneapolis Star Tribune his brother had retired after a career as a security officer with the U.S. State Department.
Bruce Smith declined to talk to an Associated Press reporter Monday outside his brother's home. A makeshift barricade blocked the driveway and a board leaning against it bore the spray-painted words "Keep Out."
Brady's sister, Crystal Schaeffel, told the Star Tribune that Kifer had stolen prescription drugs from her home before. Little Falls police records show Crystal Schaeffel reported a theft Aug. 28, but the department said the report was not public because that investigation was continuing and because it named juveniles.
Schools in Little Falls, about 100 miles northwest of Minneapolis, made counselors available, though classes weren't in session Monday. In nearby Pillager, where classes were in session, a few students sought help from school counselors and local clergy members available at the school Monday morning, said Superintendent Chuck Arns.