More than 3,000 new postal workers have been hired in the D.C. area recently, as the post office works to reduce the number of late mail deliveries — two years after a mail carrier was murdered working after dark.

Tyson Barnette was delivering mail at about 7:30 p.m. in November 2013 when someone shot him and left him for dead. Police have not made an arrest in the case.

Alton Branson, a 38-year carrier for the U.S. Postal Service, says Barnette’s slaying raised fears among his colleagues throughout the region.

Read more: Two Years After Slaying, Post Office Adds Carriers to Reduce After-Dark Deliveries | NBC4 Washington