A Bloomington man was transported to Hennepin County Medical Center after suffering a life-threatening head injury during a reported bar fight with a sibling Friday night (Feb. 17) in Watertown.

Carver County Sheriff’s deputies responded to a report of a fight at the Riverside Bar on the 100 block of South Lewis Street in Watertown. The victim was lying in the street, unconscious. Sheriff’s deputies found a group of people surrounding the victim, Derrick Douglas Sommerfeld, 32, attempting to provide first-aid.

Members of the group told the deputy Sommerfeld had not been assaulted, but had simply fallen to the ground.

Deputies provided emergency first aid until paramedics from Ridgeview Ambulance arrived. Deputies began their investigation by closing the bar to secure the scene, later serving a search warrant at the bar to review video evidence. They identified witnesses who reported Sommerfeld had been assaulted by one of his siblings.

According to witnesses, Sommerfeld and his sibling were fighting when the man punched Sommerfeld, knocking him to the ground. The suspect, a 36-year-old man from Otsego, Minn. whose shirt had been ripped and stained with blood, changed into a clean shirt provided by a bartender, and left the scene.

A short while later, the suspect returned to the bar, wearing the shirt provided by the bartender. He approached a deputy and acknowledged involvement in the fight. He was arrested for first-degree assault and was taken to the Carver County Jail to be held for court.

The incident remains under investigation.