Four years to the day after Nathan Ross Cross was gunned down in North Preston, police are appealing for witnesses to come forward to help them solve the homicide.

The 21-year-old was wearing body armour when shooting started around 6:30 p.m. outside the local firehall on April 24, 2011.

Cross ran from the scene, but collapsed on a lawn on nearby Churchill Terrace. He died in an ambulance on the way to hospital.

On Friday, RCMP said they are still investigating but believe there are witnesses who have information that could lead to arrests and possible charges.

Cross's case is included in the province's reward list for major unsolved crimes. The program offers up to $150,000 for information leading to arrest and convictions in certain specific cases.

Police are urging anyone with information to come forward and speak with investigators. Tips can also be left with CrimeStoppers at 1-800-222-TIPS (8477), texting TIP202 and a message to 274637, or online at www.crimestoppers.ns.ca.