Very cool. Shot four times in the chest and stomach, and at least once in the left temple. The hole in the back may be an exit wound.
My guess is that the killer saw him riding his scooter with a helmut on. He got him off the scooter and then shot him in the torso. That probably killed him. Then the killer took off Adriano's helmut and shot him in the left temple to make sure he's a goner.