Trayvon Martin, 17, was unarmed and carrying Skittles and an iced tea when he was shot and killed Feb. 26, 2012, by neighborhood watch volunteer George Zimmerman.

George Zimmerman, right, is congratulated by his defense team after being found not guilty during Zimmerman's trial in Seminole circuit court in Sanford, July 13, 2013.

George Zimmerman's family celebrates after the jury found him not guilty in the 2012 shooting death of Trayvon Martin at the Seminole County Criminal Justice Center in Sanford, Fla., July 13, 2013.

Attorneys Natalie Jackson, Benjamin Crump, and Daryl Parks, from left, sit in for the Trayvon Martin family during George Zimmerman's trial in Seminole circuit court in Sanford, Fla., July 13, 2013.

Seminole County court investigator Robert Hemmert carries George Zimmerman's jacket out of the courtroom during the Zimmerman trial at the Seminole County Criminal Justice Center, in Sanford, Fla., Saturday, July 13, 2013.

A Sheriff's deputies carries trial evidence of Trayvon Martin's hooded sweatshirt out of the courtroom for George Zimmerman's trial in Seminole circuit court July 13, 2013 in Sanford, Fla.

A Sheriff's deputies carries trial evidence Trayvon Martin's shirt out of the courtroom for George Zimmerman's trial in Seminole circuit court July 13, 2013 in Sanford, Fla.

A Seminole County Sheriff's deputy carries Trayvon Martin's pants as trial evidence is moved out of the courtroom during the George Zimmerman trial at the Seminole County Criminal Justice Center, in Sanford, Fla., Saturday, July 13, 2013.

George Zimmerman (R) sits with his defense team, Mark O'Mara (L) and Don West (C), waiting for the jury to return from deliberations in Seminole circuit court July 13, 2013 in Sanford, Fla.

Defense attorney Mark O'Mara holds up the photo of George Zimmerman from the night of the Trayvon Martin shooting, during closing arguments for the defense in Zimmerman's murder trial, July 12, 2013 in Sanford, Fla. Judge Debra Nelson ruled that the jury can also consider a lesser manslaughter charge along with the second-degree murder charge in the shooting death of Trayvon Martin.

George Zimmerman's father, Robert Zimmerman Sr., testifies for the defense during his son's trial on July 10, 2013.

Assistant state attorney John Guy, front center, uses a foam dummy to describe the altercation between George Zimmerman and Trayvon Martin to defense witness and law enforcement expert Dennis Root, right, during Zimmerman's trial on July 10, 2013.

Defense witness Eloise Dilligard is sworn-in for testimony via teleconference in the George Zimmerman trial in Seminole Circuit Court, in Sanford, Fla., July 9, 2013. Dilligard was a neighbor of Zimmerman in 2012 and testified that she thought it was Zimmerman's voice on the 911 tape.

George Zimmerman leaves the Seminole County Jail after posting bail, as shown in this still image taken from video, Friday, July 6, 2012, in Sanford, Fla. Zimmerman left the Seminole County Jail a day after Circuit Judge Kenneth Lester granted a $1 million bail with strict conditions. He is required to stay in Seminole County.

Judge Debra Nelson instructs the jury at the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., July 2, 2013.

A reenactment video shows George Zimmerman with Sanford police investigators, taken the after the Trayvon Martin shooting, is projected for the jury during the 16th day of his trial on July 1, 2013.

Witness Rachel Jeantel, right, continues her testimony to defense attorney Don West on day 14 of George Zimmerman's trial on June 27, 2013.

Diana Smith, crime scene technician for the Sanford Police Department, shows the jury a bag of Skittles, which was collected as evidence, on June 25, 2013.

Diana Smith, crime scene technician for the Sanford Police Department, shows the jury George Zimmerman's gun, which was collected as evidence at the crime scene, during Zimmerman's trial in Seminole circuit court in Sanford, Fla. June 25, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.

Assistant state attorneys John Guy, left, and Richard Mantei, behind panel, hold up Trayvon Martin's sweatshirt as evidence during George Zimmerman's trial on June 25, 2013.

Defense attorney Mark O'Mara, left, with co-counsel Don West in Seminole circuit court, Sanford, Fla., June 24, 2013.

George Zimmerman is sworn in as a witness in Seminole Circuit Court with his attorneys Mark O'Mara and Don West during a pre-trial hearing April 30, 2013 in Sanford, Fla.

Text and photos from Trayvon Martin's cell phone, including images Martin smoking and a pistol, were released by George Zimmerman's defense team.

George Zimmerman, left, walks out of the intake building at the John E. Polk Correctional Facility with an unidentified man, April 22, 2012, in Sanford, Fla. Zimmerman posted bail on a $150,000 bond on a second degree murder charge in the February shooting death of 17 year-old Trayvon Martin In Sanford, Fla.

George Zimmerman at the police station after shooting Trayvon Martin.

George Zimmerman at the police station after shooting Trayvon Martin.

In this photo taken with a personal iPhone, Zimmerman is photographed at the scene of the crime. Zimmerman's face is bloodied and his nose appears broken.

George Zimmerman's Kel Tec PF-9 9mm handgun.

A plastic bag found at the crime scene.

A first aid kit at the crime scene.

A flashlight found at the crime scene.

A new photograph obtained exclusively by ABC News shows a bloodied George Zimmerman with injuries on the back of his head on the night he shot and killed Trayvon Martin.

George Zimmerman, right, appears for a bond hearing with his attorney Mark O'Mara, left, at the John E. Polk Correctional Facility April 12, 2012 in Sanford, Fla. Zimmerman was charged Wednesday with second-degree murder in the fatal shooting of 17-year-old Trayvon Martin Feb. 26, 2012.

George Zimmerman is shown in a booking photo April 11, 2012. Zimmerman, 28, a neighborhood watch captain, shot 17-year-old Trayvon Martin, an unarmed, black teen visiting his father Feb. 26. Zimmerman and his supporters say the shooting was in self-defense after Martin attacked him.

George Zimmerman is escorted into the police station in Sanford, Fla., April 11, 2012.

The parents of Trayvon Martin, Sybrina Fulton, right, and Tracy Martin, hold hands as they watch a news conference in Washington with special prosecutor Angela Corey announcing charges against George Zimmerman, April 11, 2012.

Lawyers Craig Sonner, left, and Hal Uhrig speak with the media in Miami April 10, 2012, about having lost contact with George Zimmerman. They said they were withdrawing from the case because they had lost contact with Zimmerman, who is refusing to answer their calls, texts and emails.

The body of Trayvon Martin is seen on February 26, 2012, the night that he was shot in Sanford, Florida.

George Zimmerman is seen in a police mugshot from a 2005 arrest.

George Zimmerman is seen in this image taken from surveillance video the night Trayvon Martin was killed, February 26, 2012.