Trayvon Martin Case: Widespread Outrage

Protests have cropped up nationwide, demanding justice for a slain teenager.
2:05 | 03/21/12

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Transcript for Trayvon Martin Case: Widespread Outrage
It's this story that's ignited fierce passions across the nation as allegations of racism and miscarriage of justice terror part. A small Florida town three weeks ago trade on -- an unarmed black teenager. Was shot down by a white neighborhood watchman who claimed self defense. And has not at this point been arrested. And it's -- the public outcry that spread like wildfire ABC's Matt Gutman brings us the latest now. From Sanford floor. This is the face of seventeen year old tree -- Martin. Whose death has provoked weeks of demonstrations and massive Internet petitions and tonight he ran out -- your. And in this small city of Sanford Florida a vote of no confidence that we Tibet of police -- These are just the latest twist in the case. It's galvanizing the country following the shooting Martin. On February 26 he left his father's the currencies ousted by skills and iced tea during the NBA all star game making his way along this path. In crime watch volunteer George Zimmermann spotted it began to follow him. I. -- always get a -- about it. India that we don't agent. But Zimmerman does anyway. He begins chasing him. This guy looks like he's got -- -- he's on drugs -- home. As we learn from his girlfriend -- at this point. He's terrified. -- -- -- -- -- -- ABC news was there exclusively. She told her story to the Martin family attorney. -- village -- cost -- Let alone spend what you got. Cannot crush. -- -- -- -- -- A -- of 911 calls. Obama is speaking at hand what these -- until they're run going right back. I'm pretty sure guide -- out here only. The residents reporting these chilling -- -- -- single gunshot. -- -- -- -- Zimmerman immediately claimed self defense which investigators on the scene accepted. But investigators also ignored key witnesses ABC news has learned had failed to contact others like Martin's girlfriend. The police department definitely needs to go back re interview everyone and anyone has any information as well as the FBI guarantee -- so they're gonna do that's going to be their first stop. And -- while Sanford police claiming they are handcuffed yours -- along the law is called stand your ground. Passed in 2005. -- allows someone to use deadly force when they feel threatened. Since the law justified homicides in Florida have jumped threefold. Twenty states have similar laws but Florida as is seen as the most extreme -- when one of their. In fact another man on trial for manslaughter in Florida right now -- invoking the law to try to get the case dismissed and back in 2007. Norman -- fired fourteen bullets into a pair of men he thought were gang members under the law he walked free. -- -- hasn't been charged with a crime but even friends say he might have gone too far so this is the route to -- -- -- to take. In his nightly patrols -- frank Jackie was a former block captain of the local crime watch and worked with -- Pulling out his weapon and shooting. Seems extreme it it doesn't really sound like self defense to most people hear about it I agree with you but then again something ramp that. -- this altercation to the point where. Use -- -- -- forces. We. The boy was killed. We just can't bring their quarterback. Sam my heart goes out for the family. Morton died -- John -- I'm pretty sure guided out here all. Unidentified and unclaimed for 48 hours because of apparent police red tape tonight -- -- -- Is anonymous no more. And tonight in New York Martin's parents joined the yeah. We're far -- are. Boulevard. Baton. They're more dog is okay we're back goodness it's doing its best it was -- -- More than a thousand people watching supported the teenager. Whose name is -- around. I'm Matt -- for Nightline in --

This transcript has been automatically generated and may not be 100% accurate.

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