Robert E. Crimo III arrives at the Lake County Courthouse in Waukegan on Monday morning on the first day of his trial in connection with the mass shooting that occurred at the Fourth of July parade in Highland Park in 2022. | Photo: Nam Y. Huh/AP (Pool)

The trial officially began Monday morning for the accused Highland Park parade mass shooting suspect with jury selection underway. The trial is expected to last at least a month.

Robert Crimo III, 24, of Highwood, appeared at the Lake County Courthouse in Waukegan on Monday morning before Lake County Judge Victoria Rossetti.

Crimo III was wearing a suit and tie. He was not handcuffed as he had been at prior court hearings.

Potential jurors were filling out jury questionnaires on Monday morning as prosecutors said they are seeking to dismiss 48 of the 117 charges against Crimo III — specifically the aggravated battery by discharge of a firearm charges.

Robert E. Crimo III watches as the jury selection process begins at the Lake County Courthouse in Waukegan on Monday morning on the first day of his trial in connection with the mass shooting that occurred at the Fourth of July parade in Highland Park in 2022. | Photo: Nam Y. Huh/AP (Pool)

Crimo III still faces 21 counts of first-degree murder and 48 counts of attempted murder.

Robert Crimo Jr., the father of Crimo III, said in a statement: “I love my son very much. I fully support his decision to go trial in this case. Like any human being in this country, Bobby deserves the presumption of innocence and a fair trial. No matter what happens, you will always be my son.”

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Highland Park Mayor Nancy Rotering said the Highland Park community is “once again reminded of the immense pain and trauma” caused by the Fourth of July shooting.

“Our hearts remain with the victims, their families, and all those whose lives were forever changed by that devastating day,” Rotering said.

“The trial, overseen by Lake County State’s Attorney Eric Rinehart and his office, represents a critical moment in the pursuit of accountability for this horrific act of violence. This trial brings us closer to the truth and acknowledgment of the harm done,” she added.

Lake County Judge Victoria A. Rossetti listens during the jury selection for the trial of Robert E. Crimo III at the Lake County Courthouse in Waukegan on Monday. | Photo: Nam Y. Huh/AP (Pool)

On Thursday, Rossetti ruled on a motion filed by prosecutors requesting that the victims of the Highland Park shooting be permitted at trial.

Under Illinois law, crime victims have the right to be present at trial unless they are to testify and the court determines that the victim’s testimony would be “materially affected” if they hear other testimony during the trial.

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Rossetti said each victim witness’ testimony would include their observations, where they were, what occurred and their injuries, and that testimony would not influence other victim witnesses.

“Obviously that decision whether they wish to stay in the courtroom is up to each individual victim witness,” Rossetti said.

Robert Crimo Jr. and Denise Pesina, the parents of accused Highland Park parade mass shooter Robert E. Crimo III, talk during the first day of the trial for their son at the Lake County Courthouse in Waukegan on Monday. | Photo: Nam Y. Huh/AP (Pool)

The judge has repeatedly informed Crimo III leading up to the trial that the trial would proceed without him if he refused to appear in court.

The trial is not being videotaped or streamed as Rossetti has previously denied extended media coverage requests filed by news outlets.

Rossetti said in December 2023 that the trial could last four to six weeks, including 7-10 days for jury selection.

Crimo III was charged in July 2022 with 117 charges after being accused of opening fire on paradegoers attending the Fourth of July parade near Second Street and Central Avenue in Highland Park on July 4, 2022.

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Lake County State’s Attorney Eric Rinehart asks questions during the jury selection for the trial of Robert E. Crimo III at the Lake County Courthouse in Waukegan on Monday morning — the first day of Crimo’s trial in connection with the mass shooting that occurred at the Fourth of July parade in Highland Park in 2022. | Photo: Nam Y. Huh/AP (Pool)

Prosecutors previously said Crimo III admitted to “looking down his sights” of his Smith & Wesson M&P 15 semi-automatic rifle before opening fire on the Highland Park crowd.

Crimo III told investigators he fired two full 30-round magazines before loading a third 30-round magazine and firing.

Seven people were killed and dozens of others were shot. 83 spent shell casings were recovered at the scene.

Crimo III has been held in the Lake County Jail without bond since July 6, 2022.