The mothers of Trayvon Martin and George Zimmerman listened Friday to the same 911 recording of someone screaming for help, and each said she was convinced the voice was that of her own son.

The starkly conflicting testimony over the potentially crucial piece of evidence came midway through Zimmerman's murder trial in the 2012 shooting of the unarmed 17-year-old. "I heard my son screaming," Sybrina Fulton, the teenager's mother, said firmly after she was played a recording in which distant, high-pitched wails could be heard in the background as a Zimmerman neighbor asked a dispatcher to send police.

Moments later on the call, there was a gunshot and the crying stopped. Gladys Zimmerman, though, testified she recognized the voice all too well: "My son." Asked how she could be certain, she said: "Because it's my son."

The testimony came on a dramatic, action-packed day in which the prosecution rested its case and the judge rejected a defense request to acquit Zimmerman on the second-degree murder charge.