The legal defense team for George Zimmerman is accusing prosecutors of withholding crucial evidence they said proves Zimmerman's self-defense claim in the fatal shooting of Trayvon Martin.

Zimmerman's attorney, Mark O'Mara, received a color photo of Zimmerman's bloody face from the night of the shooting in Sanford on Feb. 26.

Until now, O'Mara's team only had a black and white copy of the image.

"Tell us," said O'Mara. "Stop playing hide the ball, stop playing this Marco Polo thing where I have to keep looking, and you keep moving it. Give us the information, and let's get to a hearing."

The following message accompanied the photo on O’Mara’s website:  "This is a photo of George Zimmerman taken by a police officer on the night of February 26, 2012. A black and white photocopy of this image was provided by the State in the first Discovery.

This high-resolution digital file was finally provided to the defense on October 29, 2012. This image was disclosed in the State's 9th Supplemental Discovery.  

In accordance with the updates to our media policy that we published on November 13, we will be making all public documents related to the case available on our website, including the rest of the State's 9th Supplemental Discovery as soon as we are sure it has been properly redacted according the the Court's stipulations on protecting information regarding specific witnesses."

O’Mara also said prosecutors never told them about a witness who heard Martin's father say it wasn't Trayvon's voice on a 911 call screaming for help.

Zimmerman’s father said it was his son who could be heard screaming for help.

The FBI said it could not determine whose voice was screaming for help that night.

A hearing is scheduled for next week in the case.