(CNN) -- George Zimmerman, charged with second-degree murder in the shooting death of Trayvon Martin, had a "little hero complex" but was not a racist, a Sanford, Florida, homicide investigator told federal agents, according to reports released Thursday. In an interview with FBI agents in March, investigator Chris Serino told authorities he "believed that Zimmerman's actions were not based on Martin's skin color, rather based on his attire, the total circumstances of the encounter and the previous burglary suspects in the community," according to an FBI report. The reports and other information in the case against Zimmerman were released Thursday by Special Prosecutor Angela Corey to Zimmerman's attorney.
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NEW: Zimmerman's attitudes on race not the issue, Martin family attorney says
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Multiple witnesses tell federal authorities that George Zimmerman is not racist
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A co-worker says Zimmerman was "devastated" after Trayvon Martin's shooting
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Zimmerman is accused of second-degree murder
@placeholder, in the e-mails, notes there has been a "spike in robberies and home invasions in the neighborhood within the past two months."