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GREELEY, Colo. — A former Colorado Republican Party chariman who blamed a "major diabetic episode" for causing him to cast his ex-wife's ballot in 2016's presidential election has been convicted of forgery and voter fraud.

Steve Curtis was convicted Thursday after prosecutors said DNA evidence and handwriting analysis linked him to the ballot.

Defense attorney Christopher Gregory said Curtis filled out and mailed the ballot, but didn't have the "required mental state" to commit a crime.

Prosecutor Tate Costin said Curtis knew what he was doing, asking "If he were going to sign a name during this confused diabetic state, wouldn't he sign his own name?"

Curtis' ex-wife moved to South Carolina after they separated and learned her ballot had been cast after calling the clerk's office to see how she could vote.