CHICAGO – The mother of Robert Crimmo III in the Highland Park Independence Day parade had a troubled past marred by allegations of abuse by her ex-boyfriend and other wrongdoing, according to court documents. Denise Pesina, 48, also allegedly left Crimo III, 21, in a hot car when he was a toddler and completed 100 hours of community service for driving under the influence in 2012. Lake County court documents shed additional light on Crimo III’s troubled childhood and his mother’s troubled past. On Monday, the 21-year-old was accused of killing at least seven people and injuring dozens more after he climbed onto a roof above a Fourth of July celebration and then opened fire. HIGHLAND PARK WEDNESDAY JULY SUSPECT GROWED UP WITH LUCKY PARENTS WHO OFTEN CALLED 911 AT HOME: DOCUMENTS Police arrest Robert “Bobby” E. Crimo III, 21, the suspect in the mass shooting that killed seven people and injured dozens more at a Fourth of July parade. (Associated Press/Katherine Rappel/Highland Park Police) “If you grow up in that kind of traumatic environment, it can create an imbalance,” said John Kelly, a criminal profiler and psychotherapist who has interviewed many killers. “There is no question.” He said early childhood is most important for a person’s formative years, but brain development can continue into the mid-20s. In August 2002, when Crimo III was a toddler, Pesina allegedly left him in a hot car for 27 minutes while he shopped at Toys ‘R Us. “Defendant left Robert Crimo III unattended in a motor vehicle while the motor vehicle was parked in the parking lot of Toys R-US (sic), 1610 Deerfield Road, Highland Park, Lake County, Illinois, for approximately 27 minutes while the windows were down. it was wrapped, the car was turned off and the temperature outside was approximately 79,” the warrant states. He was 2 years old then. In August 2002, when Crimo III was a toddler, Pesina allegedly left him in a hot car for 27 minutes while he shopped at Toys ‘R Us. (Fox News Digital) That led to her conviction for endangering the life or health of a child, a Class A misdemeanor. “If nobody cared about him growing up, then he didn’t have that empathy,” Kelly told Fox News Digital Friday. “Why does he have no remorse or guilt or empathy for other people? I’ve seen this in many serial killers because they were abused.” And in 2012, Pesina was sentenced to a year of probation and 100 hours of community service for driving under the influence after he was pulled over with a flat tire and a BAC of 0.21%. He had a “strong smell of alcohol on his breath and weakness [field sobriety tests],” a police officer wrote in a report at the time. HIGHLAND PARK FOURTH OF JULY SHOOTING: A TIMELINE OF EVENTS She completed her community service “very creditably in good spirits,” according to a letter from her supervisor. A photo of accused 4th of July shooter Robert Crimo III with his father Bob Crimo (left) and mother Denise Pesina (right). (FBI/Facebook brochure) The charges are in addition to numerous 911 calls to the family’s Illinois home on McDaniels Avenue in which the parents repeatedly accused each other of verbally arguing. Many of the altercations ended with Robert Crimo Jr., Crimo III’s father, leaving for the night, either voluntarily or at the request of the police, and he was arrested at least once. HIGHLAND PARK FOURTH OF JULY PARADE ATTACK: Shooting suspect’s father still not cleared, police say A shocking case came before Crimo III was born that involved Pesina’s ex-boyfriend Steven Brown. In 1999, Pessina sought an order of protection against Brown, whom she accused of sexually assaulting her 4-year-old daughter, Crimo III’s half-sister. The girl’s father had previously died of carbon monoxide poisoning, according to court documents. She also had to sue to establish paternity so the child would have a share of Brown’s estate. Mother and daughter each went to counseling, and Pessina spent time in the hospital “due to the physical abuse of Steven Brown.” Pessina also alleged that Brown harassed her and her daughter by making “unsolicited phone calls and showing up at their residence.” Denise Pesina’s allegations of harassment and abuse against her ex-boyfriend, Steven Brown, in 1999. (Fox News Digital) Pessina had other affairs with men besides her husband while Crimo III was growing up. A man named David Daniels is listed in multiple police reports at the family’s home, claiming to be Pessina’s “boyfriend,” which she disputed. She also accused a neighbor, William Hollander, of making unwanted advances on her, and Crimo Jr. called the police one night to tell them the neighbor had given his wife a bottle of wine. Police also visited the family’s home twice in 2019 due to alleged threats from Crimo III, although his parents declined to press charges and no criminal charges were filed. If police or parents had intervened then, Kelly argued, Crimo III might not have been able to legally purchase the four firearms he later took, including the Smith & Wesson M&P 15 rifle he allegedly used in the massacre. A composite photo of alleged July 4th parade shooter Robert Crimo III (right) and his mom Denise Pesina. (Facebook/FBI) “The way it usually works is he would have been arrested, he would have had to get a lawyer,” Kelly said. “The prosecutor would say, ‘Get him into counseling and get us some reports on him. We want to make sure he’s not a risk. … He would have been evaluated for his mental health, and at that point, I don’t know if he would still be able to buy the rifle.” CLICK HERE TO GET THE FOX NEWS APP The first incident, in April, occurred after Crimo III allegedly threatened to kill himself. The second was for threats to kill his family. Later that year, he applied for an Illinois Firearm Ownership ID sponsored by his father. “I’ve seen this a million times, where the alcoholic parents then feel guilty because they drank and carried on and fought and everything while they were raising the child, and the guilt makes them capable,” said Kelly, the criminal who works with the profile. “And what that means for him is I don’t know everything because not all the information is out there, but this could create a situation where the father would enable him by helping him buy the rifle.” Audrey Conklin is a digital reporter for FOX Business and Fox News. 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