A tourist from Argentina was killed by a single punch in Brazil, and it was all captured on CCTV. 23-year-old Matias Sebastian Carena was brutally assaulted and knocked unconscious in the streets of Rio de Janeiro, Brazil On March 25th after leaving a nightclub. Even after he hit the ground, at least four men set upon him with a vengeance. Authorities believe it was death, not a simple beating, that the four men had in mind all along. At least one those suspects fled to Spain, and Interpol has been notified. None of them have been captured.