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Rosemount teen charged with hiding murder weapon

Zachary Butler-Martinez may have broken up the fight that resulted in the death of 17-year-old Cody Casey, but Rosemount police believe he also helped his younger brother hide the knife he used to stab his Rosemount High School classmate.

The Dakota County Attorney's office charged Butler-Martinez Monday with aiding an offender, a serious felony.

Cody Casey died Thursday afternoon after being stabbed several times in the driveway of Butler-Martinez's home on Dallara Avenue. Casey, an RHS senior, rode his bike about half a block before collapsing. He was pronounced dead at Regions Hospital in St. Paul.

The boy suspected of stabbing Casey, who has not yet been named by police, told investigators Casey had come to his house early Thursday afternoon looking for a third brother and refused to leave. The boy told police he went inside to get a knife, but Casey still refused to leave.

According to the complaint Casey was carrying a sock with a rock in it and used it to hit Butler in the head. That's when the boy reportedly stabbed Casey several times.

Butler-Martinez said he had to pull his brother off of Casey.

During initial interviews both Butler-Martinez and his brother told police they didn't know where the knife was. Later, though, Butler-Martinez told police he was concerned his brother was going to get into trouble so he wiped the knife off and threw it in a nearby sewer.

Police found the knife in the sewer.

If convicted, Butler-Martinez could face up to 20 years in jail.

The Dakota County Attorney's office expected to charge Butler-Martinez's brother Monday morning. His name will not be released until charges are filed.