Prosecutors in the George Zimmerman murder case this morning called to the witness stand Trayvon Martin’s mother to testify that her son can be heard screaming for help in the background of a 911 call placed moments before the unarmed teenager was shot to death.

Sybrina Fulton, 47, told jurors that she "instantly" recognized her late son’s voice on a February 26, 2012 call placed by a woman who reported that a fight was underway in her Sanford, Florida gated community.

Asked by a prosecutor to identify who was yelling for help, Fulton answered “Trayvon Benjamin Martin.” When she was earlier asked to identify her two children, Fulton named her late son, adding “he’s in heaven.”

Fulton, seen above, was followed to the witness stand by her 22-year old son Jahvaris, who testified that Trayvon Martin, his step-brother, was the person heard screaming on the 911 call. 

The identity of the individual crying for help is especially crucial for both sides in the case since it would likely indicate whether Martin or Zimmerman was in distress and fearful for their life.

In a March 2012 police report referencing the screams heard on the 911 calls, Sanford Police Department Detective Christopher Serino noted that, “this voice was determined to be that of George Zimmerman, who was apparently yelling for help as he was being battered by Trayvon Martin.”

Two days after the shooting, Martin’s father told cops that he did not believe it was his son yelling on the 911 calls.

In a meeting at the Sanford Police Department headquarters, Tracy Martin was played the 911 calls “in order to provide a better understanding to Mr. Martin as to why the individual who shot his son was not arrested and charged with homicide,” according to a police report.

After the recordings were played, Serino asked Martin if that was his son’s voice screaming for help. “Mr. Martin, clearly emotionally impacted by the recording, quietly responded ‘No,’” Serino noted.

Tracy Martin, who subsequently declared that Trayvon was, in fact, crying for help on the emergency calls, is not expected to be called as a government witness.