The victim, Zykier Flowers, was shot at the LEAD Fest Carnival, which was being held in the parking lot of the Concord Mall, back on the night of May 11.
The reward is being offered by Delaware Crime Stoppers.
Flowers was one of two teens shot. The other victim, a 17-year-old boy, was treated at the hospital for serious injuries, police say, and has since been released.
According to police, a fight broke out between several people near the entrance of the carnival.
During the fight, an unknown suspect pulled a gun and fired several shots, hitting the two teenagers.
The suspect then fled the scene in an unknown direction.
Octavia Flowers says she hears about gun violence in Wilmington often, but she never expected her 16-year-old son to be a victim.
"It's hard for me, my firstborn. My child lost his life like -- one of the worst phone calls you could ever get," she told Action News.
She says her son was an aspiring sports entertainment lawyer and someone who was always willing to do whatever he could to put a smile on the faces of others. He also had big plans, like any teen his age, as he looked ahead to his junior year in high school.
"He just got his ID a month ago. You would've thought it was a license. He was so excited," said Octavia Flowers.
A funeral service will be held for the teen next week.
Anyone with information is asked to contact Detective B. McDerby by calling 302-741-2729.
"If you see this and you're out there, just turn yourself in," said Octavia Flowers
Police may also be contacted by sending a private Facebook message to the Delaware State Police or contacting Delaware Crime Stoppers at 1-800-847-3333.
The shooting led to the cancelation of the carnival, which was among several shut down across our area due to violence and unruly behavior.