Beatriz Luis Garcia said she left Havana in 1993 to find a life away from the repression of Fidel Castro’s dictatorship.

Little more than a decade later, she was identifying her 17-year-old son’s body after he was shot to death by a Miami-Dade police officer during a burglary attempt. More than four years after the death of Leonardo Barquin, a string of interoffice memos from the state attorney’s office has surfaced on the Internet, thrusting the open investigation of the shooting back into the spotlight.