Baltimore County Police charged an 18-year-old with first-degree murder in the fatal shooting of a Lansdowne High School student earlier this year.

Police said Challah Haywood was arrested on Monday for killing 16-year-old Kamau Xavier Campbell in the hours after school dismissal on March 4.

Campbell’s mother, Pricilla Jones Campbell, previously told The Banner that her son was waiting with others for a ride outside of the King Dollar in the shopping center on Hollins Ferry Road.

Charging documents state that it was Haywood who jumped out from the front passenger seat of a passing silver Honda Accord and began shooting at Campbell.

Video surveillance footage shows Campbell running towards the school parking lot as he is chased by a man dressed in a light grey “Essentials — Fear of God” hooded sweatshirt, sweatpants and a black balaclava-style face mask.

Police allege it was Haywood who continued to shoot Campbell several times until he collapsed in front of the school. The teen was transported to the R Adams Cowley Shock Trauma Center, where he was pronounced dead.

Police tracked the silver Honda Accord to the Arbuta Arms Apartments complex, a five-minute drive from the school. The vehicle is registered to Haywood, who police later saw getting into the driver’s seat.

Two hours before the murder, charging documents say, Haywood had posted a video on his Instagram account wearing the same outfit as the gunman in surveillance footage. Police used Haywood’s phone GPS data and gunshot residue from his hands to further link him to the homicide.

In the weeks following Campbell’s death, family and friends struggled to make sense of it. In previous interviews with The Banner, they described Campbell as a skilled football player and songwriter, as well as a natural leader.

Family members called the firstborn son “Daddy,” citing his deep sense of justice and responsibility. To his autistic brother, nine years his junior, Campbell was a best friend and a fierce protector.

With dreams of attending pharmacy school, owning his own business, saving up for a car and visiting Miami, Campbell “would make a rainy day seem sunny,” his mother said. “He would make you laugh when you want to cry.”

“He was too kind of a kid to get murdered,” said Campbell’s father, Antonio Campbell.

Haywood was being held without bond, police said Monday.

Cayla Harris contributed to this report.

This article has been updated.