Police had earlier said the shooting victim was 20 years old. His name has not been released.
The shooting was reported at 4:12 p.m. in the 100 block of Antlers Lane, off U.S. 40 and Route 72.
An hour later, the victim’s body remained on the pavement at the edge of the parking lot in front of a townhome.
Police were still on the scene investigating at 10:30 p.m., Officer First Class Tom Jackson said.
Two off-duty firefighters performed CPR on the victim, “who suffered an apparent gunshot wound to the upper extremity,” Jackson said.
The officers continued CPR efforts but the man was pronounced dead by New Castle County paramedics.
Witnesses reported seeing a male fleeing the area on foot toward U.S. 40, but a search by county and state police, including K-9s and a helicopter, failed to locate him.
Jackson asked anyone with information to call 302-395-8110 or 302-573-2800.