Sanford police surveillance video from ABC News may shed new light on the Trayvon Martin investigation. The video shows George Zimmerman at the Sanford police station not long after he shot and killed 17-year-old Martin.

Zimmerman was in handcuffs the night he was taken to the police department after he shot and killed 17-year-old Martin.

Police checked his pockets, and then three officers casually walked him to a room on the second floor where he was questioned.

Zimmerman claimed that Martin confronted him, punched him in the nose and bashed his head into the sidewalk.

However, in the video Zimmerman doesn't to be in pain and he doesn't seem to have any visible injuries to his head.

WFTV legal analyst Bill Sheaffer said the video is not necessarily a game changer.

"The video may not tell the entire story. Who we need to hear from are the paramedics that treated him at the scene, law enforcement testimony, as to their observations and any photographs," Sheaffer said.

Sources close to the investigation said there is at least one picture of Zimmerman's injuries at the scene.

It was taken by an officer with his personal cellphone.

A police report said Zimmerman had a bloody nose and blood on the back of his head.

Joe Oliver, who is acting as a media consultant to Zimmerman, said Zimmerman was treated by a doctor for his head injuries the day after the shooting, and he didn't know his nose was broken until the doctor told him.

Martin's mother, Sybrina Fulton, appeared frustrated during an appearance on CNN Wednesday night.

"This video is clear evidence that there is some problem with this case, and he needs to be arrested," Fulton said.

Community leaders in Brevard County aid they will hold a roundtable discussion on the Martin shooting.

Norman Wolfinger is the state attorney for both Brevard and Seminole counties.

Since Martin's shooting, Wolfinger has been criticized for not filing charges against Zimmerman. 

Organizers said the roundtable is an opportunity for residents to meet with candidates running for state attorney so they can discuss their concerns.