Casey Anthony Trial: Drowning Theory Mentioned In Jail House Recordings

The theory that 2-year-old Caylee Anthony drowned in her family's swimming pool briefly arose again today, in a video-recorded jail visitation between the toddler's grandparents and her mother, who is accused of murdering Caylee.

The video, which was played today for jurors during the ninth day of Casey Anthony's murder trial , was filmed on Aug. 3, 2008, less than a week after what would have been Caylee's third birthday.

"Someone just said that Caylee was dead this morning -- that she drowned in the pool. That's the newest story out there," Cindy Anthony told her daughter.

"Surprise, surprise," a dismissive Casey Anthony replied.

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Last week, Anthonys defense attorney, Jose Baez, told the jury Caylee accidentally drowned in the swimming pool on June 16, 2008. He also alleged that Casey Anthony's father, George Anthony, was the one who found his granddaughters body. George Anthony has since denied the allegation.

What the jury did not hear was that just minutes before that jail visit occurred, George Anthony had lashed out at a reporter when the accidental death theory was raised.

"Do you have anything to say about a new theory that Caylee may be dead and that it may be an accident?" a reporter asked, according to Orlando's WKMG Channel 6 News .

"Shut up," an angry George Anthony yelled. "Shut up."

On the video played for the jury, Casey Anthony's frustration quickly grows and at one point she threatens to "just walk away."

"I'm frustrated and Im angry, and I don't want to be angry," Anthony told her parents. "This is the first time that I've truly, truly been angry this entire time, but I'm so beyond frustrated with all of this -- I can't even swallow right now because it hurts."

Asked by her mother if she thought Caylee was OK, Casey Anthony replied: "I know in my heart, I know in my gut she's OK."

On Thursday, Jurors watched approximately three hours of the jail visitation videos. Prosecutors said they expect to finish showing them this afternoon. So far, Anthony has showed little emotion while listening to the recordings.

Casey Anthony, 25, is charged with first-degree murder in the death of Caylee. If convicted, she could face the death penalty.

The trial continues Saturday at 9 a.m.