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This is the horrific moment a gunman calmly climbed off a motorbike and shot a teenage boy dead in front of his helpless younger brother.
CCTV captured Mynor Steven Martinez Lemus, 19, and his brother William, sitting side-by-side leaning against a wall in the notoriously violent Guatemala City.
The pair, who were drinking cans of soda, watched as a motorbike pulled up nearby and the pillion passenger got off and walked towards them.
Suddenly, the passenger pulled out a gun and shot the teenager in the head.
The gunman fired several times before getting back on the bike and riding off with his accomplice.