Beaver Dam Raceway general manager Carolyn Mueller http://www.mtv.com/artists/the-cars/ and Bumper to Bumper IRA Outlaw Sprint Car Series President Steve Sinclair confirmed the death.
Semmelmann's car made contact with another car during the second practice session, flipped three times and hit the outside wall. The 47-year-old Semmelmann, from Brookfield, was racing for the first time this season.
The race was canceled.
Beaver Dam Raceway is a 0.33-mile clay oval about 75 minutes northwest of Milwaukee. Mueller said it was the first on-track fatality at the track since the facility re-opened in 1993.
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