Mr. Ketcik and Ms. Halstead turned themselves in to the Sumter County Sheriff’s Office Detention Center on Nov. 29 and Dec. 8, according to the sheriff’s office. Mr. Rider was arrested by Brevard County deputies at a cruise ship terminal at Port Canaveral on Dec. 3, according to prosecutors.
It was not clear whether the three residents knew each other. Each was booked into a detention center or jail and released the same day of their arrest, records show.
A probable cause affidavit said that, in addition to casting more than one vote in Florida in October 2020, Ms. Halstead and Mr. Rider also cast second ballots in New York through an absentee ballot. Mr. Ketcik was also accused of voting through mail in Florida and casting a second, absentee ballot in Michigan.
The investigation into allegations of voter fraud by Mr. Ketcik, Ms. Halstead and Mr. Rider was initiated by the office of the Sumter County supervisor of elections, Bill Keen, according to arrest records. His office did not immediately respond to an inquiry for comment about the charges.
Even though voter fraud is extremely rare, Republican leaders in several states, including Gov. Ron DeSantis of Florida, have cited isolated cases to pursue tougher rules around voting in the wake of the 2020 election. On Wednesday, Christina Pushaw, a spokeswoman for Mr. DeSantis, said, “Multiple voting is unlawful.”
She added, “It isn’t a crime to be registered to vote in more than one state, as long as you only vote in one.”
Ms. Pushaw said that in 2019, the state joined the Electronic Registration Information Center, a nonprofit group that helps states improve the accuracy of voter rolls. By joining the system, she said, state officials could crosscheck voter registration data to find duplicate registrations and outdated records.