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BREAKING: Sheriff’s Office makes arrest in connection with Blue Mounds homicide

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Riley Berg mug for web
Riley Berg
Nicholas Day

DANE COUNTY (WKOW) – A Mount Horeb man has been arrested in connection with the January death of Nicholas Day.

Riley Berg, 21, was taken into custody Thursday and faces a tentative charge of first degree intentional homicide.

Dane County Sheriff David Mahoney made the announcement at a Friday afternoon news conference.

Mahoney said at this time, investigators are unaware of any previous connection between Berg and Day. He asked for additional tips on the incident and any possible link between the men, as motive remains a mystery.

"We don't know why," Mahoney said. "That's part of why we continue to ask the community who may know about Nick and Riley and try to come up with that motive."

The body of Nicholas Day, 26, was discovered Jan. 15 on County Highway JG near Bergum Road in the town of Blue Mounds.

Investigators at first thought the death was from a hit-and-run, but it later was later ruled a homicide.

Investigators can be reached through our tip line at (608) 284-6900. Deputies and detectives will continue to have a presence in the area as they follow-up on information.

Day’s body was discovered by a passerby in the early afternoon of January 15th.

Mahoney said Berg's car appeared on video in Mount Horeb on the day of the homicide. Mahoney says Sheriff's deputies also saw Berg at a county park close to where Day's body was found on County Highway JG.

An autopsy by the Dane County Medical Examiner revealed that Day had suffered a gunshot wound and had sustained several lacerations to his neck.

“Nicholas was a son, a loving father and a U.S. Veteran. This is a tragic event, that will live on for some time, especially for the two families whose lives have been torn apart,” Mahoney said.

Court records show Berg refused to cooperate with Iowa County authorities during a 2018 traffic stop. Records show a criminal charge was dropped in favor of a citation. Online records indicate Berg has no criminal record.

A Dane County District Attorney's representative says Berg may appear in Dane County court Monday.

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