A 23-year-old Colorado man was formally charged by the Adams County District Attorney’s Office with first-degree murder Thursday, in a suspected road-rage incident that left a 13-year-old boy dead, and three others shot and injured.

Jeremy Webster is being held without bond at the Adams County Detention Facility in the death of 13-year-old Vaughn Bigelow. The boy’s 41-year-old mother, Meghan Bigelow, and 8-year-old brother, Asa, are listed in critical condition at a hospital, The Denver Post reports. Bystander John Gale, who reportedly made eye contact with the alleged killer, took bullets to both arms.

According to police, Bigelow and Webster began arguing on a busy street corner of Westminster, a suburb of Denver, as the woman drove her children to a dentist office Thursday afternoon.

The Westminster Police Department reported that Webster subsequently followed a vehicle driven by Bigelow for several blocks. The two reportedly began arguing again before the suspect allegedly opened fire, shooting the woman and two of her children in a parking lot located near 80th Avenue and Sheridan Boulevard, KDVR reports. A third child belonging to Bigelow, Cooper, was able to seek shelter inside of a building without being injured. Webster also allegedly shot Gale, who was sitting in his truck accompanied by his 9-year-old daughter.

Authorities caught up with the suspect near Castle Rock on Interstate 25, where he was arrested while reportedly driving back to his home in Colorado Springs.

During an interview with detectives following his arrest, Webster allegedly confessed to the shooting and reported that the gun he used was located in the trunk of his car, according to The Denver Post. A search warrant affidavit obtained by the newspaper said the suspect alleged to officials that he began taking a new medication for mental health issues only hours before the shooting.

[Feature image: Bigelow family/GoFundMe]