Iowa holds a special election on June 27 to fill the empty State House seat, 22nd district. According to this story, the Republican and Libertarian Parties placed a nominee on the ballot, but the Democratic nominee missed a filing deadline and will be a write-in candidate. There is also an independent candidate in this race.
In November 2016, the district had only the Republican incumbent on the ballot.
There are three candidates in the race. In addition to the Republican and Libertarian candidates, the widow of the deceased Representative is running as an Independent.