A 19-year-old teenager, Mynor Steven Martinez Lemus was repeatedly shot in the head as his helpless younger brother watched on helplessly in Guatemala City.
The gunman casually climbed off a motorbike and shot Mynor dead in front of his helpless younger brother.
CCTV captured Mynor and his brother William, sitting side-by-side leaning against a wall drinking cans of soda in the notoriously violent Guatemala City.
The pair watched as a motorbike pulled up nearby and the passenger got off and walked towards them with a gun and shot Mynor five times in the head. He died on the spot.
The gunman got back on the bike and rode off with his accomplice.
Police have launched an investigation into the murder and believe it to be gang related and are trying to identify the killer from the CCTV footage.
Residents told local media that both of the brothers were well-known drug dealers in the neighbourhood.