The Essex County Prosecutor’s Office is offering a reward for information that could help lead to an arrest in a 4-year-old murder case.

Authorities say that Newark Liberty International Airport employee Bruce Santos, 26, was gunned down in downtown Newark on Feb. 27, 2013. Officials believe that Santos was the victim of a robbery.

Officials released a sketch of a suspect shortly after Santos was killed. That sketch depicts a man with dreadlocks.

A reward of up to $20,000 is being offered for information leading to an arrest and conviction.

Anyone who may have information about the shooting is asked to call the Essex County Prosecutor’s tip line at 1-877-847-7432.