
Between August 2002 and January 2004, Da Silva carried out at least twelve attacks on young boys aged from 8 to 14.
His modus operandi consisted of offering victims money or sweets in order to lure them to forested areas, where he beat them using his martial arts skills and then sexually violated them. Ultimately, he strangled his victims with a rope. During a reconstruction of the crime scenes, da Silva indicated the precise locations of the victims' bodies, and when semen samples were taken from two of them, his DNA was conclusively linked to his genetic profile.
Confirmed Victims:
- Éderson Leite, age 12: killed August 16, 2002
- Douglas Oliveira Hass, age 10: killed April 2003
- Volnei Siqueira dos Santos, aged 12: killed July 9, 2003
- Alessandro Silveira, age 13: killed September 2003
- Junior Reis Loureiro, age 10: killed September 2003
- Jéferson Borges Silveira, age 11: killed September 2003
- Leandro Dornelles dos Santos, age 8: killed October 2003
- Luciano Rodrigues, age 9: killed November 2003
- Daniel Bernardi Lourenço, age 14: killed January 3, 2004