Hours after a teen allegedly shot and killed a man outside a Gwinnett County daycare Saturday,  police say he and three other teens carjacked and stole money and pizza from a delivery guy.

Caziah Brown, 15, of Lilburn, was arrested and charged with murder in the shooting death of Curtis Oldham, 21, of Lawrenceville, Gwinnett County police Sgt. Jake Smith said Monday. Brown also faces aggravated assault, armed robbery and theft charges.

Police said Oldham was found dead about 3:40 p.m. Saturday outside of Childtime day care facility in unincorporated Lilburn.

Oldham was sitting on the passenger side of a black car at the day care, police said. A woman was sitting in the driver’s seat.

"It is likely that the shooting occurred elsewhere and the day care parking lot was convenient as the driver sought help for the victim,” Smith said.

Oldham was taken to the hospital where he later died.

Statement from family of murder victim Curtis Oldham: Police have arrested a 15 yr old in the crime . Curtis Oldham, CJ...

Posted by Tony Thomas on Monday, December 19, 2016

About seven hours later, Brown was allegedly involved in another incident in Lawrenceville with three other teens aged 15, 16 and 18.

Police say the teens ordered a pizza to an abandoned home and stole the pizza, $50 and the delivery driver’s car. According to arrest warrants, one of the teens, 18-year-old Joshua Tarrant pointed a BB gun at the victim.

The delivery driver was also allegedly threatened with a taser.

“They were pointing the gun at me and the other guy had the Taser and was zapping it,” the delivery driver told Channel 2 Action News.

Channel 2's Tony Thomas reports.

The armed robbery and carjacking helped lead to Brown’s arrest, police said. According to Channel 2, Brown’s lengthy juvenile record made it easy to find him in the system.

Detectives followed up on multiple leads in Oldham’s shooting and a SWAT team served a warrant in the 1000 block of Lochshyre Way in unincorporated Lawrenceville, Smith said.

Authorities are still trying to figure out why Oldham was shot.

“The possibility this shooting is related to a drug deal is also under investigation,” Smith said.

In a statement to Channel 2 Action News, Oldham’s family said he had plans to enter the navy and pursue a degree in computer science.

“We ask for privacy as we mourn, but we do hope our tragedy can in some way bring awareness to the senseless gun violence plaguing our country and ripping our children from our arms,” the family wrote.

Police have not released the names or charges of the other two teens involved.

Anyone with information in the case is asked to call Gwinnett police at 770-513-5300. Tipsters can also remain anonymous and be eligible for rewards of up to $2,000 by contacting Crime Stoppers at 404-577-TIPS or crimestoppersatlanta.org.