Brooks is accused of plowing into the Waukesha Christmas parade last year, killing six people and injuring dozens more.
"I owe you your honor and the court an apology and I am going to stand up as a man and tell the whole court, I apologize, and the bailiffs that I apologize for my actions," Brooks said. "That is not how I was raised."
The jury heard testimony from several witnesses for the state Monday, including Thomas Green, the father of two victims who were injured at the parade, as well as parade attendees and first responders.
More testimony expected in Wisconsin holiday parade attack trial
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Friday was an emotional day in court.
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Wisconsin parade attack witnesses to relive violence in trial
Brooks' ex-girlfriend testified about a violent encounter she says she had with him on the same day of the parade.
The jury also saw graphic police dash-cam video of the scene.
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Brooks, who has no legal training, is representing himself at the trial. He has repeatedly disrupted the court proceedings with defiant and outlandish behavior.
Waukesha Christmas parade suspect removed from courtroom, takes shirt off
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