Rocha had had a rough childhood in which he was sexually abused by a neighbor when he was 11 and bullied by other students at school. But neither really explains why the killer began his spree in his early 20s.
Rocha chose to hunt down mostly longhaired girls and women between the ages of 13 and 29. His method was to ride up to them on a motorcycle and shoot them. He finally was caught when police set roadblocks on the streets and intercepted him.
"I never heard of a person with such coldness," said Alexandre Barros Bruno, commissioner of the police unit involved in the investigation, to the BBC [source: Lissardy].