Five robbers shot an armored truck guard to death outside a food packaging company, and police Tuesday searched for witnesses to help them identify the bandits who fled with more than a half-million dollars.

The guard tried to resist the robbers who held up he and his partner as theypicked up receipts from a wholesaler in a deserted area of Hunts Point about 2:30 p.m. Monday in the Bronx, police said.David Fleming, 49, a retired city corrections officer, was declared dead about an hour later at Lincoln Hospital.

The robbers held up Fleming and his partner as they left the Kwak Trading Co., a wholesale distributor of Mexican and African foods, said detective Joseph McConville, a police spokesman.