Casey Anthony's Mother Set to Testify in Hearing on 911 Tapes

George and Cindy Anthony listen during a court hearing for their daughter Casey Anthony in Orlando, Fla. on Friday, December 11, 2009. Anthony is charged in the death of her 2-year-old daughter Caylee Marie Anthony in 2008. (AP Photo/ Red Huber, Pool)
AP Photo/ Red Huber
Casey Anthony's Mother set to Testify in 911 Call Hearing
Caylee Anthony (Family Photo)

ORLANDO, Fla. (CBS/WKMG) Exactly two years to the day that Caylee Anthony's disappearance made national headlines, her maternal grandmother is scheduled to testify at a hearing for Caylee's mother, Casey Anthony, about the frantic 911 call that launched a months long search for the 2-year-old girl.

PICTURES: Casey Anthony Personal PhotosPICTURES: Caylee Anthony: A Life Cut Short

Cindy Anthony can be heard on the 911 tapes telling the dispatcher that her daughter Casey just told her that her granddaughter has been missing for a month and seems to indicate that she suspects Casey had something to do with it.

"There is something wrong," Cindy Anthony tells the 911 dispatcher on July 15, 2008. "I found my daughter's car today and it smells like there's been a dead body in the damn car."

Casey Anthony's defense attorneys have argued against the admission for the tapes saying they fall under the hearsay rule and shouldn't be used against their client. They have filed a last minute opposition in an attempt to prevent Thursday's hearing.

Casey Anthony's Mother Set to Testify About 911 Call
Cindy Anthony (AP/ Red Huber)

Prosecutors say that the tapes indicate Cindy Anthony had suspicions about her daughter's involvement in Caylee's disappearance and possibly that she believed Caylee was dead. They are arguing that the tapes qualify as "excited utterances" and therefore should be admitted as an exception to the hearsay rule.

PICTURES: Casey Anthony Personal PhotosPICTURES: Caylee Anthony: A Life Cut Short

Should the hearing go forward Brad Conway, the Anthony family's attorney, says Cindy Anthony will answer questions about the 911 calls calmly. He said she will acknowledge she was frantic when the call was made, even though that admission could hurt her daughter in her trial for first-degree murder in Caylee's death.

Prosecutors also want to use the tapes to show what they call the first of many lies Casey Anthony told to explain Caylee's disappearance. The call is the first record of Casey Anthony's claim that a nanny has kidnapped Caylee a month previous.

Casey Anthony's defense team had a team of experts examine evidence in the case on Tuesday and Wednesday, including the Pontiac Sunfire Cindy Anthony referenced in her 911 calls, according to CBS affiliate WKMG.

The defense is hoping its team of experts will find something in the car that proves Anthony's innocence in Caylee's death, according to the station.

Complete Coverage of Casey Anthony on Crimesider.