Highland Park, Illinois, mass shooting suspect Robert Crimo III changed his plea to guilty on Monday as his trial was set to begin.

Robert Crimo III is accused of killing seven people and injuring dozens of others in the mass shooting at a 2022 Fourth of July parade in the Chicago suburb of Highland Park.

The suspected Highland Park, Illinois, mass shooter declined to change his plea to guilty at a Wednesday hearing, shattering victims' families.

Robert Crimo Jr., the father of the suspected Highland Park, Illinois, mass shooter, pleaded guilty to reckless conduct instead of beginning his trial on Monday.

The father of the suspected Highland Park, Illinois, mass shooter pleaded guilty to reckless conduct instead of beginning his trial on Monday.

In honor of what would've been Joaquin's 23rd birthday, the Olivers are visiting cities across the country that have been impacted by gun violence.

Hundreds of people gathered to mark the one year since seven Fourth of July paradegoers were shot and dozens of others were wounded in a mass shooting.

Seven people were killed in the 2022 mass shooting in Illinois.

Cooper Roberts, 8, is undergoing a "slow and difficult" recovery, his mom said.

The father of the suspected Highland Park, Illinois, mass shooter has been charged with seven counts of reckless conduct causing great bodily harm.

The case focuses on the Fourth of July parade attack that left seven people dead, and authorities are charging the suspect’s father who helped him obtain a gun license.

Liz Turnipseed, Debra Baum and Lindsay Hartman, who were strangers before the shooting, are uniting this Thanksgiving with family to focus on their gratitude for life.

Cooper Roberts, who was shot and partially paralyzed in the Highland Park, Illinois, mass shooting, has returned to school for the first time since the shooting.

Victims of the Highland Park shooting are filing lawsuits against gunmaker Smith & Wesson, the accused shooter and the accused shooter's father.

Victims of the Highland Park shooting are filing lawsuits against gunmaker Smith & Wesson, the accused shooter and the accused shooter's father seeking damages.

Cooper Roberts, who was shot and partially paralyzed in the Highland Park, Illinois, mass shooting, still has a "very long and hard road" to recovery ahead of him

Cooper Roberts, 8, was paralyzed in the shooting in Highland Park, Illinois.

The man accused of carrying out a mass shooting on the Fourth of July pleaded not guilty to not killing seven people and wounding dozens of others. The victims' ages ranged from 8 to 88.

Robert Crimo III, 21, allegedly killed seven people after opening fire on a Fourth of July parade near Chicago.

Robert Crimo III, the suspect in the Highland Park, Illinois, shooting, is accused of killing seven people and injuring dozens of others.

After escaping the carnage of the July 4 mass shooting, Ashbey Beasley said she's devoting her life to curbing gun violence.

Eight-year-old Cooper Roberts, who was enjoying a Fourth of July parade when he was shot in the chest in a mass shooting, is now paralyzed from the waist down.

After escaping the carnage of the July 4th mass shooting Ashbey Beasley said she's devoting her life to curbing gun violence. She was on hand during congressional hearings focused on gun makers.

The suspect in the Highland Park mass shooting has been indicted on 117 counts, prosecutors in Lake County, Illinois, said Wednesday.

A Chicago-area woman volunteered to pay for mental health treatment.

The mayor of Highland Park, Illinois, pleaded with Congress to pass a federal assault weapons ban 16 days after a mass shooting at a Fouth of July parade in her town.

Highland Park Mayor Nancy Rotering pleaded for a federal assault weapons ban during a Senate Judiciary Committee hearing on gun violence Wednesday.

The Jewish community of Highland Park is trying to grieve and find meaning through Jewish institutions and practice after the July 4 mass shooting.

Survivors of the Highland Park and Uvalde mass shootings converged on Washington, D.C., Wednesday to demand an assault weapons ban.

Natalie Lorentz, a survivor of the July 4th shooting, and Sen. Tammy Duckworth are working together to fight for change and a federal ban on assault weapons.

A mother and father, grandparents and a dyed-in-the-wool Chicagoan are among the people killed by a gunman who opened fire on a July 4 parade in Highland Park, Illinois, on Monday.

Memorial services and funerals have begun for the victims of a Fourth of July parade shooting in Highland Park, Illinois, as the community continues to grieve.

The first two funerals and a memorial service were held Friday for three of the seven victims shot and killed at the deadly Fourth of July parade.

Services have been scheduled for Friday for three of the victims.

The community is gathering for the first funerals and memorial service for those who lost their lives.

Cooper Roberts's mom was also injured in the shooting in Highland Park, Illinois.

Newly revealed police reports show the troubled past of the suspect’s family as we learn more about the survivors of the rampage. ABC’s Mona Kosar Abdi reports.

Funerals for Stephen Straus, 88, Nicholas Toledo, 78, and a memorial service for Jacki Sundheim, 63, who were three of the seven people killed in the mass shooting, are scheduled for Friday.

Police documents were released Thursday that detail Highland Park shooting suspect Robert "Bobby" Crimo III's troubled past and family turmoil.

“We are a small ship in an ocean of a lot of guns," mayor told ABC News Live.

A longtime Highland Park July 4th paradegoer said she narrowly dodged a bullet during the mass shooting.

Police confirmed a long history of calls from the home of the suspect charged in the deadly parade shooting in Highland Park, Illinois.

The suspected shooter killed seven people and injured dozens in the Independence Day shooting in Highland Park, Illinois.

Illinois state Sen. Julie Morrison shares her experiences from the mass shooting at a July 4 parade in Highland Park.

The latest on the investigation into the July 4th parade shooting and whether the father of the shooter could face charges.

“I had no -- not an inkling, warning -- that this was going to happen,” Crimo told ABC News.

In the wake of the Highland Park, Illinois, shooting, donors had raised millions across 11 different pages as of Wednesday, according to a GoFundMe hub of pages.

Highland Park Mayor Nancy Rotering on how her community is coping after the parade tragedy.

ABC News’ Alex Perez reports that the suspect’s father sponsored his gun application but maintains that their family had no idea their son was planning a massacre.

ABC News senior investigative reporter Aaron Katersky and ABC News contributor John Cohen discuss the ongoing investigation as suspect confesses to considering a second attack.