For the first time, the brother of George Zimmerman is speaking out on national television about the night Trayvon Martin was killed.

Robert Zimmerman Jr. appeared on CNN's "Piers Morgan Tonight" on Thursday night and said his brother is devastated by the killing. He also said that 17-year-old Martin picked the fight with 28-year-old George Zimmerman.

Robert said when his brother and Martin started fighting it became a matter of life and death. He said his brother could've easily been killed by Martin because the teen was going for his gun.

"He stopped someone from disarming him and shooting him. He didn't pull out a gun and shoot him," said Robert Zimmerman. "Nobody stood there with Skittles and an iced tea. You return force with force when somebody assaults you."

Robert denies his younger brother chased Martin and he stands by George's claim of self-defense.

"This fantasy, or mythology, that he chased a person is absolutely false," said Robert Zimmerman.

George Zimmerman claims Martin punched him in the nose and bashed his head on the ground, but in video WFTV obtained from the Sanford Police Department, he does not appear to have any injuries.

Robert was also asked about the video and he said there are visible injuries.

"To me, his nose looks swollen in that video. I'm his brother," said Robert Zimmerman. "A lot of these injuries take 36 hours to show."

Since last month's shooting Robert said his brother has been in hiding and is traumatized.

"He has very severe emotional injuries. He's been diagnosed with Post Traumatic Stress Disorder," said Robert.

He also says his entire Zimmerman family has received death threats and some people have even mistaken Robert for George because the two look alike.

Robert Zimmerman also called his brother a neighbor everybody would want to have. He said the backlash that's happened is a "carnival of hatred."

"The people who love and support George respect the legal system," said Robert Zimmerman.

A new witness has come forward to talk about what he says he saw just after George Zimmerman shot and killed Martin.

"He didn't appear hurt or anything else. He just kind of seemed very, I guess very worried or whatever. He walked on the sidewalk at that point with his hand up to his forehead," said the witness.

The witness did not want to reveal his identity during the national interview. He is one of six witnesses police talked to after the incident.

The mortician who prepared Martin's body last month has spoken out. He said he only saw the boy's gunshot wound in the chest and that Martin had no other bruises or injuries.

"I did not see any markings on the body that would indicate to me that he had been in a scuffle or fight," said Richard Kurtz, of Roy Mizell & Kurtz Funeral Home.

Martin's autopsy has not been released because it's part of the ongoing investigation.

Film director, Spike Lee, has settled with a central Florida couple after he used Twitter to post the wrong home address of George Zimmerman.

This is the message, that Lee re-tweeted last week: "The address is actually the home of a Sanford couple in their seventies who say they've been terrorized by the incident."

Lee apologized to the couple for the error. Details of the settlement have not been released.