An ex-girlfriend of Darrell Brooks said she was "mortified" by Sunday's attack in Waukesha.
She told the New York Post she was "embarrassed" Brooks was the father of her child.
Brooks is charged with five homicides after a vehicle rampage at the city's Christmas parade.
A former girlfriend of the man suspected of killing six people and injuring 58 more in a car rampage in Wisconsin told the New York Post she was "mortified" and couldn't sleep since the event.
Darrell Brooks, 38, was charged Tuesday with five counts of intentional homicide after the killings in the city of Waukesha.
The police say he was the driver of a red Ford Escape that plowed through crowds of people celebrating Waukesha's Christmas parade on Sunday.
A further charge is expected next week after an 8-year-old, Jackson Sparks, died of his injuries. A cash bond of $5 million was set for Brooks on Tuesday, court records show.
The Post did not name the ex-girlfriend, identified as the mother of one of Brooks' children, saying she feared for her safety.
"When I saw his picture online, I was like, 'What the fuck?'" she is reported as saying.
Brooks did not stick around long as a father, she said, leaving her to raise their boy after three months. According to the paper, she lives in southern Milwaukee.
At the time of Sunday's horrific events, Brooks was on bail over a charge of running over an ex-girlfriend in his car just three weeks earlier. According to the Post, this was a different ex.
The Milwaukee County district attorney's office said after Sunday's events that the $1,000 bail he had been granted was "inappropriately low."
The woman who talked to the Post said Brooks' mother, Dawn Brooks, desperately regretted covering his bail.
"She's wrecked that people were killed as a result and she's like, 'I'm blaming myself, because had I not bailed him out, this wouldn't have happened,'" the woman is reported as saying.
The woman told the paper she was already "embarrassed" that Brooks was the father of her child "because he wasn't taking care of him." She continued: "What do you think I am now? Mortified."
Saying she wished she could replace her son's father with another person, she added that she was "sickened by it, obviously devastated, can't sleep," the paper reported. "I've been donating and saying prayers and doing everything that I can."
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