The two-year-old was confirmed to have been reunited with his grandparents after strangers spread the word on social media.
Hours later, CBS News confirmed the boy’s parents, Irina and Kevin McCarthy, were killed in the shooting.
The young child named Aiden was found alone and bloodied on Monday morning as the Illinois city’s family-friendly Independence Day parade suddenly turned into a bloodbath, leaving seven victims dead and dozens more injured.
A local chef grabbed the boy and quickly took him out of the path of danger when the gunman opened fire on the crowds, according to CBS Chicago’s Jackie Kostek.
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The reporter shared photos of the terrified little boy on Twitter to help reunite him with his family members, writing that he was “safe but with strangers”.
In the images, the child was seen clutching a blanket for comfort while his leg and shoes appeared to be covered in dried blood.
CBS later revealed that a Highland Park police officer had collected the child from the home of a woman who was caring for him and took him to hospital to try to reunite him with his loved ones.
By later on Monday afternoon, the boy had been reunited with his grandparents at a local hospital.
On Tuesday afternoon, Irina and Kevin McCarthy were announced as victims of the shooting. A GoFundMe campaign was set up raising money for their son Aiden.
“In the aftermath of the Highland Park, IL shootings on July 4, the North Shore community rallied to help a boy who we knew nothing about. We took him to safety under tragic circumstances, came together to locate his grandparents, and prayed for the safety of his family,” the GoFundMe description signed by Irina Colon reads.
“Sadly, I need to share his name…Aiden McCarthy. And he needs more of our help. His parents Irina & Kevin were killed during the July 4 shooting. At two years old, Aiden is left in the unthinkable position; to grow up without his parents.
“Aiden will be cared for by his loving grandparents, Misha and Nina Levberg, and he will have a long road ahead to heal, find stability, and ultimately navigate life as an orphan. He is surrounded by a community of friends and extended family that will embrace him with love, and any means available to ensure he has everything he needs as he grows.
“On behalf of his family, and with their permission, I am establishing this fundraiser to support Shim and the caregivers who will be tasked with raising, caring for, and supporting Aiden as he and his support system embark on this unexpected journey.”
Four other victims were named by the Lake County coroner on Tuesday afternoon: Katherine Goldstein (88); Jacquelyn Sundheim (63); Stephen Straus (88); and Nicolas Toledo-Zaragoza (78).
A seventh victim, who died on Tuesday, has not been named.
The family of 76-year-old grandfather Nicholas Toledo confirming his death on Monday afternoon.
The elderly man, of dual US and Mexico nationality, used a wheelchair and was sitting in it when he was struck by bullets.
Mr Toledo’s granddaughter told the New York Timesthey “were all in shock” and revealed that her grandfather hadn’t wanted to go to the parade but did so to join his family.
A second victim was also identified on Monday night as a devoted member of a local synagogue.
Jacki Sundheim was remembered by the North Shore Congregation Israel as a “lifelong” congregant and “cherished” staffer whose “work, kindness and warmth touched us all”.
The suspected gunman, 21-year-old Robert Crimo, was arrested on Monday night following an eight-hour manhunt, when he was spotted by a police officer driving along a highway.
He has not yet been charged over the mass shooting.