Doug Butzier, the Libertarian candidate in the Iowa race for U.S. Senate, was killed in a plane crash on Monday, Butzier’s wife confirmed to local Iowa TV station KCRG-TV.

The crash happened near Dubuque Regional Airport. Butzier was the sole occupant of the single-engine plane. The plane crash happened roughly one mile north of the Dubuque runway after taking off from the Ankeny Regional Airport, according to the Federal Aviation Administration.

Butzier served as an emergency room physician at Mercy Medical Center-Dubuque, according to the Dubuque Herald-Telegraph.

A Public Policy Polling survey of the Iowa Senate race conducted in late September found Butzier was pulling 2 percent of the vote among likely voters.

Correction: This story originally said the crash happened one mile north of the Ankeny Regional Airport. It happened north of the Dubuque runway. We regret the error.

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