Transcript for Trayvon Martin: Investigating the Investigation
The FBI has decided to take action in that case of the seventeen year old gunned down by a man who said he was acting as a neighborhood watchdog. It BC's Matt Gutman has been investigating this story from the beginning and was struck by a nagging question about how the case has been handled. And has more on that for -- not. Tonight as the Department of Justice investigate tree -- Martin's killing as a possible hate crime. Questions are piling up -- police -- possibly racist remark by the shooter George Zimmermann. In his call to police that night ABC news has also learned that police didn't reach out to -- girlfriend. Why is that important she was on the phone with -- that night as he was being followed by George Zimmermann. This guy look like he does no good editor is on drugs or home. Why aren't heard everything up until these fatal gunshot and could presumably be a critical witness describing each -- step. Leading to Martin's death. ABC news was there exclusively as Morton Stanley attorney questioned his girlfriend about what she heard that night. But analysts. Are probably a little. Less -- -- stand logic on our -- Police have the call logs obtained exclusively by ABC news and her number but according to the girl never call. Voters have -- the main reason the police say they stand by their investigation. That -- police department criticized for withholding these 911 calls for setting up a narcotics investigator to the scene. Instead of a homicide detective. And for not giving the shooter a drug and alcohol -- that night. The police department definitely needs to go back re interview everyone and anyone has any information as for the shooter 28 year old George Zimmermann. He is married. -- father says -- -- Half Hispanic and is not a racist. But now both he and the police department that never arrested him are under fire Matt Gutman ABC news center Florida.
This transcript has been automatically generated and may not be 100% accurate.