Theresa Alexander, 39, of Brooklyn, New York.

A woman working as a live-in caregiver has been found guilty of striking her 82-year-old patient multiple times earlier this year in Island Lake.

Theresa Alexander, 39, whose last known residence was in Brooklyn, New York, was charged with two counts of aggravated battery on an elderly person, two counts of domestic battery, unlawful possession of a fraudulent driver’s license and obstructing identification.

Following a bench trial on Friday, McHenry County Judge Michael Coppedge found Alexander guilty of aggravated battery, domestic battery, possession of fraudulent driver’s license, and obstructing identification.

The Island Lake Police Department arrested Alexander on February 25.

Prosecutors said Alexander used a fake name and false identification while working as a live-in caregiver for an 82-year-old woman in Island Lake.

A police investigation uncovered an abusive relationship between Alexander and the victim, prosecutors said, adding that Alexander struck her elderly patient multiple times.

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A criminal complaint alleged that Alexander struck the victim in the face with a closed fist, pushed her chest with an open hand and grabbed her inner thighs and forearms.

A sentencing hearing is scheduled for September 24.

The case was investigated by members of the Island Lake Police Department and prosecuted by Tyler Mikan and Christian Michalik of the McHenry County State’s Attorney’s Office.