The lawyer for Trayvon Martin's family is filing a formal request with the Justice Department, asking whether Florida prosecutors were negligent in not charging George Zimmerman, the neighborhood watchman who killed him.
The Martin family wants to know why the Florida state attorney Norm Wolfinger allegedly overruled police who wanted to arrest Zimmerman on February 26.
Wolfinger stepped down from the case last month. Angela Corey, Wofinger's replacement has been re-interviewing witnesses and examining evidence.
The case sparked questions nationwide about whether race played a role in the killing, during which Zimmerman insisted he shot Martin in self-defense.
Zimmerman has said he was jumped and threatened in a Sanford, Fla., gated community, and that the attack by Trayvon Martin left him in fear for his life.
Zimmerman's brother said medical records would in fact prove that this was an act of self-defense, even if the police video doesn't show any obvious injuries.
Martin's relatives, including his brother, do not accept that story.