MIAMI – Detectives are searching for the armed robber who killed Walter Castaneda in Miami’s Little Havana.

A surveillance video shows the robbery was about 8:15 p.m., on Friday, outside of Castaneda’s Boost Mobile, at 443 NW 12 Ave. A memorial there was growing on Tuesday afternoon.

Castaneda’s son Walter Castaneda, Jr. said witnesses saw the armed robber was waiting to ambush him from behind and shot him in the stomach. Surveillance video shows Castaneda pulled out his gun and fired at the robber — who fled in a white getaway car.

Castaneda’s grandchildren were waiting nearby when the shooting happened, his son Walter Castaneda, Jr., said. Another surveillance video shows the driver of the white car speeding away.

“They saw my dad on the floor in so much pain,” he said, adding he had a message for the killer: “We will find you … Maybe you can be watching this now, you can be laughing, you can be enjoying the money, but the money is not going to last long.”

Officers are asking anyone with information about the armed robber and his accomplices to call Crime Stoppers at 305-471-8477.