ARLINGTON, Fla. -

It's been almost six months since a 19-year-old was shot and killed in Arlington, and still no one has been arrested for his death.

Thursday afternoon, Thomas Nunley's family and the Justice Coalition, joined by Jacksonville Sheriff's Office detectives, gathered at the scene of his death to announce a $15,000 reward for information leading to an arrest.

"You may have thought that you've gotten away with this, but you haven't," said the victim's mother, Dena Westbrook. "You may have looked to your left and looked to your right, but you failed to look up. That's who saw you, and you will pay for what you did to my son."

Reward for information on Nunley murder Police found Nunley dead on Fort Caroline Road on Dec. 9. 2012. Nunley's family told police he was working on a music project and left the home to go on a walk to clear his head. The next news they got; he was dead.

A witness told police they heard a single gunshot in the area, but not much information came after that.

"We just feel it is important to go back to the scene where the incident happened, be able to bring a reminder to everyone because someone knows about this crime. Someone has the information. The family is just traumatized and they need answers," said Justice Coalition Executive Director Ann Dugger.

Nunley's family, friends, police and the Justice Coalition appeal for information Nunley's family came up with the money being offered. His grandparents flew into Jacksonville on Wednesday to join the public appeal for help solving the case.

"You know it shouldn't take money to do the right thing but if it takes money, take the money and still do the right thing. Call in that little tip that will make the difference and get someone arrested so this family can have the answers they need," said Dugger.

If you have any information you can call the JSO Homicide Unit directly at 904-630-2172. You can call also call Crime Stoppers at 1-866-845-TIPS to remain anonymous.