A Philadelphia man is facing murder charges after police say he fatally shot a 66-year-old man and critically wounded a 16-year-old boy.

Aaron K. Scott, 21, of the 3400 block of Aldine Street, was charged Tuesday night with multiple violent crimes, including murder, criminal conspiracy, and attempt to commit murder, for the shooting death of Jeffrey Carter, 66, and the critical wounding of a 16-year-old boy near Lincoln High School in Mayfair on Monday afternoon.

» READ MORE: Jeffrey Carter, fatally shot while driving by Lincoln High School on Monday, was a grandfather and a Lincoln alum

Carter had been driving by the school when a fight broke out among a group of students. According to police, Scott fired shots toward several teenagers who were fleeing, and a stray bullet flew into Carter’s SUV and struck him in the head. Carter died less than two hours later.

The 16-year-old, whom authorities have not identified, remains hospitalized in critical condition.

Scott is incarcerated at the Curran-Fromhold Correctional Facility, records show. A preliminary hearing is scheduled for next month.

The brawl that ended in bullets started just minutes after school let out. Investigators believe that Scott has a younger brother who had been a Lincoln student and that the shooting was the violent climax to an ongoing dispute between him and the teens he fired at, Police Commissioner Danielle Outlaw said earlier this week.

The high school is adjacent to Austin Meehan Middle School and Northeast Community Propel Academy, a district school for students in kindergarten through eighth grade. Classes were still in session when the shooting began, and both Meehan and Propel were briefly under lockdown. A playground and day care are also across the street from the high school.

Carter was the 439th person killed in Philadelphia this year, which represents a 14% increase in homicides compared with the same time last year. Most of the killings were committed with guns.

A friend of Carter described a man who “lived for his family.” The retired grandfather was always up for a conversation about fishing and cars, and had a “strong relationship” with his wife, one of his longtime best friends whom he ended up marrying.

The fatal shooting was another grim moment in the ongoing gun violence crisis and the second time in less than two weeks that a Philadelphia student was shot near his school, following the death of Marcus Stokes.

Police said the 13-year-old was on his way to E.W. Rhodes Elementary when he was shot in the chest.

Staff writer Anna Orso contributed to this article.