Choking back tears, Donnelly explained that the reason he could identify the screams is because of his experience with the fog of war. During combat, Donnelly had to recognize the screams of his fellow soldiers and run to them when they needed help. He said he has heard a 250-pound man scream like a little girl.
"In the midst of combat, there are a lot people yelling and screaming," said Donnelly. "Sometimes they are screaming for help."
Donnelly told the court that he views Zimmerman as a "son," but his close relationship with Zimmerman would not affect his testimony. Donnelly donated almost $3,000 to Zimmerman's defense fund and spent $1,700 on suits for Zimmerman to wear during the trial.
Donnelly's testimony Monday was preceded by that of four of Zimmerman's other friends, who all said that they also recognized the screams on the 911 call as Zimmerman's voice. During cross-examination, prosecutors focused on potential bias -- due to their close relationships with the defendant -- on the part of the witnesses.
The defense team told Nelson that it expects to introduce Martin's toxicology reports sometime on Tuesday. Testimony is expected to resume at 9 a.m. ET.