Brooks, 39, has officially been charged with five counts of first-degree intentional homicide, according to the Waukesha County District Attorney's Office.

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The motive remains a mystery

Brooks was involved in a domestic disturbance with another person just before plowing his SUV through the parade, Waukesha Police Chief Dan Thompson said.

He said police weren't able to respond to the domestic disturbance call because reports from the parade tragedy came flooding in shortly afterward.

Early indications were that Brooks was fleeing the initial incident, according to multiple law enforcement sources familiar with the preliminary investigation findings.

He said the motive for why he crashed into the crowd remains unclear.

The suspect was out on bond for a questionable amount

Brooks was released from jail less than two weeks ago after allegedly using a vehicle to run over a woman who said she was the mother of his child, court documents show.

The woman survived the November 2 incident and was taken to a hospital for her injuries, according to a criminal complaint.

Prosecutors filed five charges related to the incident, including obstructing an officer, second-degree recklessly endangering safety with domestic abuse assessments, disorderly conduct with domestic abuse assessments and misdemeanor battery with domestic abuse assessments.

Brooks was released from jail November 11 on $1,000 bail -- an amount the Milwaukee County district attorney's office had recommended but now questions.

"The State's bail recommendation in this case was inappropriately low in light of the nature of the recent charges and the pending charges against Mr.

"The bail recommendation in this case is not consistent with the approach of the Milwaukee County District Attorney's Office toward matters involving violent crime, nor was it consistent with the risk assessment of the defendant prior to setting of bail," the DA's office said.

"This office is currently conducting an internal review of the decision to make the recent bail recommendation in this matter in order to determine the appropriate next steps."

Brooks was also charged with bail jumping because he was already out on bail following a July 2020 incident in which he was charged with two counts of second-degree reckless endangering safety with use of a dangerous weapon and one count of possession of a firearm by a felon, according to court documents.

CNN reached out to Brooks' attorney from the 2020 and earlier November 2021 incident about the DA statement but has not yet received a response.

The suspect is also a registered sex offender

Questions about why Brooks was released on $1,000 bond came as news emerged about Brooks' criminal record in Nevada.

Brooks pleaded guilty to statutory sexual seduction in November 2006, according to court and inmate records.

The warrant was issued on August 15, 2016, for jumping bail, said Sarah Johns, Washoe County Sheriff's Office spokesperson.