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21-year-old accused in 'cold, calculated, extremely violent' homicide in Blue Mounds

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MOUNT HOREB, Wis. — A 21-year-old man is facing a homicide charge in connection with the “cold, calculated and extremely violent homicide,” of Nicholas Day in January.

Dane County Sheriff Dave Mahoney said Riley Berg, of Mount Horeb, was arrested on a tentative charge of first-degree intentional homicide in Day’s death.

Day’s body was discovered by a passerby on Jan. 15. An autopsy confirmed he suffered a gunshot wound and had suffered several lacerations to his neck.

The sheriff’s office said “the motive for the killing is still unclear, and at this point, a connection between the victim and the suspect is unknown.”

Investigators are asking for anyone who knows Berg, may have information on a connection to Day, or on Berg’s activities and behavior before and after Day’s death are asked to call the tip line at 608-284-6900.

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