Armed with a sock that had a rock inside it, 17-year-old Cody Casey refused to leave the Rosemount home premises of the young man he believed liked the girl he'd asked to prom that morning.
The man's two younger brothers, Dakota Butler, 16, and Zachary Albert Butler-Martinez, 18, insisted their 19-year-old brother wasn't home, but Casey -- who had ridden his bike over after school Thursday -- didn't budge.
Butler went inside and grabbed a steak knife, then came back to ask Casey to leave again, according to a criminal complaint filed Monday.
Casey took out the sock with a rock inside it, and hit Butler in the head.
They fought in the driveway, and Butler stabbed Casey at least four times before Butler-Martinez pulled his angry brother and Casey apart, according to Dakota County Attorney James Backstrom.
"Dakota Butler went inside the home," said Backstrom, who is seeking to have Butler tried as an adult. "He could have called the police. He could have called his parents, he could have asked for help. ... Instead, he took a knife outside and after that, the confrontation escalated."
Butler, a junior at Rosemount High School, was charged in Dakota County juvenile court on Monday with second-degree murder. The case is believed to be the first homicide in the city's history.
Casey, a senior at the high school, got back on his bicycle, wobbled a block, told a passerby that he needed help, and fell onto a snow-covered boulevard between the street and sidewalk. He was pronounced dead of stab wounds at Regions Hospital in St. Paul.