Sybrina Fulton, mother of Trayvon Martin, takes the stand during George Zimmerman's trial in Sanford, Florida, on Friday, July 5. Zimmerman is charged with second-degree murder in the February 2012 shooting death of 17-year-old Martin.
Florida Department of Law Enforcement Crime Lab Analyst Anthony Gorgone testifies about DNA findings on Wednesday, July 3, in Sanford, Florida. Here, Gorgone points to a sweatshirt worn by Trayvon Martin on the night Martin was shot. Only one stain on Martin's hooded jacket yielded a partial DNA profile that matched Zimmerman's.
Gorgone points to a jacket worn by Zimmerman on the night of the shooting. Multiple stains on Zimmerman's jacket tested positive for Zimmerman's DNA. At least two stains from the jacket tested positive for a mixture of DNA that included Martin's DNA.
Firearms analyst Amy Siewert from the Florida Department of Law Enforcement answers questions from the prosecution while holding Zimmerman's gun on July 3. Siewert examined the gun and said Zimmerman had one bullet ready to fire in the chamber as well as a fully loaded magazine when the shooting occurred.
Alexis Carter, a military prosecutor, testifies during the trial on July 3. Carter taught a criminal litigation class that Zimmerman completed, and testified that the class included extensive coverage of Florida's self-defense laws.
Mark Osterman, a U.S. Air Marshal and friend of Zimmerman's who wrote a book about the case, testifies on Tuesday, July 2. He recounted the story of the shooting that Zimmerman told him and testified that when he took Zimmerman home from the police station after the shooting, Zimmerman wasn't acting like himself.
Prosecutor Bernie de la Rionda, on July 2, demonstrates a possible scenario while questioning state witness Chris Serino, a Sanford police officer.
Hirotaka Nakasone, a voice recognition expert with the FBI, testifies in the Zimmerman trial on Monday, July 1.
Witness Jonathan Good is cross-examined by defense attorney Mark O'Mara on Friday, June 28.
Selma Mora reenacts a scenario for defense attorney Mark O'Mara on Thursday, June 27. Mora lived in Zimmerman's neighborhood at the time of the shooting.
Witness Jennifer Lauer points to where her former home was in the Retreat at Twin Lakes community during questioning by defense attorney Mark O'Mara on June 27. Lauer called 911 on the night of the shooting.
Rachel Jeantel, a friend of Martin's, is questioned by defense attorney Don West on June 27. She appeared to get frustrated several times during the cross-examination, including one time when West suggested they could break until the morning so she'd have more time to review the deposition transcript." border="0" height="360" id="articleGalleryPhoto0012" width="640"/>
Rachel Jeantel, a friend of Martin's, is questioned by defense attorney Don West on June 27. She appeared to get frustrated several times during the cross-examination, including one time when West suggested they could break until the morning so she'd have more time to review the deposition transcript.
The evidence letter that Jeantel says she wrote with a friend for Sybrina Fulton, Martin's mother, is displayed during the trial on June 27. When the defense asked Jeantel to read the letter, she said she couldn't read cursive. She asked a friend to write the letter for her, she said.
Jeantel testifies on Wednesday, June 26. She was the last person to speak with Martin on the phone.
Zimmerman walks past Martin's parents, Sybrina Fulton, left, and Tracy Martin, second from left, as he enters the courtroom after lunch recess on June 26.
Diana Smith of the Sanford Police Department on Tuesday, June 25, shows the jury a bag of Skittles that was collected as evidence at the crime scene. Martin was said to be carrying the bag of candy and a soft drink at the time of his death.
protesters started wearing hoodies in solidarity against racial profiling." border="0" height="360" id="articleGalleryPhoto0017" width="640"/>Assistant state attorneys John Guy, left, and Richard Mantei hold up Martin's sweatshirt as evidence during Zimmerman's trial on June 25. After Martin's death,
protesters started wearing hoodies in solidarity against racial profiling.
During the trial on June 25, crime scene technician Diana Smith shows the jury a gun that was collected as evidence.
Zimmerman laughs with defense attorney Don West during his trial on June 25.
Selene Bahadoor enters the courtroom to take the witness stand on June 25. She was the first eyewitness to testify and said the shooting occured right behind her home.
Seminole County 911 dispatcher Sean Noffke testifies on Monday, June 24, about his conversation with Zimmerman on a non-emergency line the night of the shooting.
A transcript of Zimmerman's police call on the night of the shooting is projected during opening arguments on June 24.
Martin's father, Tracy Martin, cries on June 24 as he listens to the description of his son's death.
Prosecutor John Guy gestures during his opening arguments on June 24. His first words to the six-woman jury may have raised a few eyebrows. "Good morning. 'F*****g punks, these a******s all get away,'" Guy quoted Zimmerman. "These were the words in this grown man's mouth as he followed this boy that he didn't know. Those were his words, not mine."
From left, Zimmerman's father, Robert Zimmerman Sr.; his mother, Gladys; and his wife, Shellie, are escorted from the courtroom on June 24. Since they are all on the witness list, the judge ruled they cannot be present in the courtroom until after they testify.
Defense attorney Don West displays a photo of Zimmerman from the night of the shooting during his opening arguments on June 24. He opened his statements with a knock-knock joke but failed to win a laugh. "Knock knock. Who's there? George Zimmerman. George Zimmerman who? Good, you're on the jury," he said.
A video entered as evidence is displayed on June 24. It shows Martin, right, at a 7-Eleven on the night of his shooting.
From left, Martin's parents, Tracy Martin and Sybrina Fulton, and Benjamin Crump, the family's legal counsel, make a brief statement to the media before jurors heard opening statements on June 24.
Zimmerman waits for the start of his trial on June 24.
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- Prosecutors play the tape of a 911 call for the family members
- "Absolutely," Sybrina Fulton says when asked if it's her son's voice
- "My brother's," Jahvaris Fulton says when asked if he recognized the voice
(CNN) -- Prosecutors on Friday called Trayvon Martin's mother and brother to the stand in the trial of the man who fatally shot him.
George Zimmerman is charged with second-degree murder. His defense team argues that he shot the teen in self-defense.
A key piece of evidence was at the center of Friday's proceedings: a 911 call on the night of the shooting on which screaming can be heard.
Martin's mom hears son's final moments
Lawyers on both sides want to convince the jury of who was doing the screaming, Zimmerman or Martin.
Building a case against Zimmerman
Who is the attorney defending Zimmerman?
The audio was played in court for Martin's mother, Sybrina Fulton. She said she recognized the screaming as that of "Trayvon Benjamin Martin."
Defense attorney Mark O'Mara asked Fulton if she had no doubt that it was her son screaming.
Judge keeps control over Zimmerman trial
"Absolutely," she said.
Martin's older brother, Jahvaris Fulton, 22, also took the stand Friday.
Prosecutor Bernie de la Rionda asked him if he recognized the voice on the tape.
"My brother's," Fulton said, adding that he had "heard him yell" before, but "not like that."
The question of whether Zimmerman's actions were self-defense or murder could rest on who was the person screaming.
Martin, 17, was fatally shot on February 26, 2012.
The shooting put a national spotlight on Zimmerman's hometown of Sanford and sparked fresh debates about race relations and gun laws in America.
Zimmerman is Hispanic; Martin was African-American.
An initial decision not to pursue charges against Zimmerman led to the dismissal of the town's police chief and the appointment of a special prosecutor, who accused the neighborhood watch volunteer of unjustly profiling and killing Martin.
Zimmerman now faces a second-degree murder charge in Martin's death. He has pleaded not guilty and is free on $1 million bond.
