Jarqueese O'Brian Henigan was found guilty in the 2017 attack, in which prosecutors alleged he approached the victim, as she came out of her garage in the 3700-block of North Fremont Street.
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He sexually assaulted her, forced her into the trunk of her car at gunpoint and took her on a 23-mile journey before crashing her car on the city's far South Side.
At one point, he stopped to use her ATM card, police said.
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The woman escaped by using the emergency trunk release and called police.
Henigan is due back in court next month.