More evidence was released Friday in the Casey Anthony murder case, including the audio recording of the 911 call made when the remains of her 2-year-old daughter Caylee were found.

Caylee disappeared last June but wasn't reported missing for a month. Her skull and bones were discovered by a water meter reader in December in a wooded area near the Anthony home outside Orlando.

"I just found a human skull," the caller tells a 911 dispatcher on Dec. 11. "It's a child's skull with duct tape around the mouth."

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In addition to the 911 tapes, prosecutors released photos from more than 2,000 pages of investigative documents.

It was the latest collection of evidence investigators have made public in the case, which is set to go to trial in January.

Anthony is behind bars, charged with first-degree murder in her daughter's death. She has pleaded not guilty and says a baby sitter kidnapped Caylee.

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