ORLANDO, Fla. -- A Local 6 News report about Casey Anthony, the woman who has been charged with murdering her missing daughter, Caylee, shows that "dead zones" on her cell phone may hurt the investigation into the case.

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PHOTOS: Dive Search, Confrontation
PHOTOS: Prayer Vigil For Caylee
PHOTOS: Casey Baby Photos

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Anthony, 22, remains jailed on first-degree murder charges in the disappearance of 3-year-old Caylee, who was last seen on June 16 but was not reported missing until a month later.

Local 6 News investigative reporter Tony Pipitone analyzed hundreds of text messages and phone calls placed and received by Anthony in the two weeks after Caylee disappeared and used a database program to determine how much time passed between each ping.

There were 24 times when three or more hours passed with Anthony's phone remaining silent, Pipitone reported.

"And when you account for sleep and periods where she appeared to stay in the same place, we are left with three gaps -- or dead zones -- that raise some questions," Pipitone said.

The first "dead zone" was June 17 from 5:23 p.m. to 8:23 p.m. Anthony's phone pinged a tower close to her boyfriend's apartment near the University of Central Florida and then twice pinged a tower near Blanchard Park before going silent. The park was searched but nothing was found. In the time it took Anthony's phone to ping another tower -- three hours later -- she could have traveled as far away as Palm Bay or Ormond Beach and returned to Orange County.

June 17 was a day after Caylee was seen alive by her grandfather, George Anthony, who said his daughter and Caylee left his home at about 12:50 p.m. the day before.

Scientific evidence suggests that human remains that decomposed in the trunk of Anthony's car was there for up to 2½ days after death, Pipitone said. That would mean if Caylee died on June 16, investigators may want to focus more on June 18 into June 19, which contained two dead zones on her cell phone, he reported.

On June 18, Anthony's phone went silent at 6:57 p.m. and did not ping another tower until 8:32 a.m. June 19. In both cases, her phone pinged a tower near her boyfriend's apartment. Her whereabouts during that time is not known.

On June 19, Anthony's phone pinged near her boyfriend's apartment at 4:54 p.m., then her movements head south and east, according to cell phone pings, Pipitone said. "Heading east and hitting (a) cell tower on Lake Underhill Road ... but from here, her cell phone goes dead for three hours and 17 minutes. Where could she have gone in that time?" Pipitone said.

The last ping from the Lake Underhill tower was at 5:45 p.m., and the phone then went silent until a ping near her boyfriend's apartment. She then called her parents' home at 9:13 p.m., and there's no indication where Anthony was during the time frame.

"If this is the time Casey may have disposed of the body in her car trunk, there's no indication where Caylee may be either," Pipitone said.

Defense Inspects Casey's Car

Meanwhile, the Orange County Sheriff's Office said attorneys for Anthony will inspect her vehicle on Friday.

The white Pontiac Sunfire was found abandoned at an Orange County Amscot and reeked of death, according to statements made by an impound lot employee and George Anthony.

The car will be inspected in a service bay at the Orange County Sheriff's Office.

Bounty Hunter To Take Polygraph Test

Divers searching for the remains of Caylee on Thursday said they discovered a garbage bag containing bones and toys in a river at an Orlando park, but Orange County authorities said the findings were not credible, causing them to request the bounty hunter who led the search to take a polygraph test.

A team from Blackwater Divers, led by celebrity bounty hunter Leonard Padilla, conducted the search in the Little Econ River at Blanchard Park in Orlando.

But Orange County sheriff's officials said the findings were not bones and the discovery was not connected to the case.

"Early on the afternoon of Nov. 13, 2008, divers associated with an independent search for Caylee Anthony reported the recovery of what they believed were bone fragments and other items related to the missing toddler from the Little Econ River on Jay Blanchard Park in east Orange County. Investigators assigned to the investigation into the disappearance of Caylee responded to the park and determined that the recovered items are not associated with the case.

"The sheriff's office remains focused on the primary mission at hand, which is to locate Caylee Anthony and continues to follow up on all viable leads and tips that are deemed to be creditable in their ongoing investigation," the statement said.

Sheriff's officials said they have asked Padilla to take a polygraph test, to which the bounty hunter agreed. The FBI will conduct a polygraph test with Padilla at a later date, Orange County sheriff's Capt. Angelo Nieves said.

"There's a couple of small toys in the bag. One of them is a clover-type shaped item -- green -- and we know that Casey was big on clover-shaped items. So I told them to shut it down and get the sheriff's office out here," Padilla said.

FBI agents inspected the items, Local 6 News reported.

"We came out here to find Caylee, but you don't want to find her," Padilla said while crying. "But that's the truth of the matter. We think we have."

Padilla said he has believed for a while that Caylee's mother, Casey Anthony, left the girl's body at Blanchard Park.

"When the detectives talked to her, while she was trying to convince them (baby sitter) Zenaida (Gonzalez) took (Caylee) away at the Sawgrass Apartments, she also mentioned that she had also come out here to see -- that afternoon at 5 or 6 -- if possibly Zenaida was out here at the park because Zenaida used to bring the girl to the swings," Padilla said. "When we got into town and bailed her out, the day after she was out, she told me that Zenaida had taken (Caylee) away from her right here in front of the swings at Jay Blanchard Park."

Padilla said Casey Anthony mentioned the name Zenaida together with the park about eight times.

Caylee's grandmother, Cindy Anthony, said she was ignoring Padilla's efforts. She said if, and until, law enforcement officials comment on any finding, she was concentrating on finding Caylee alive.

Cindy Anthony said she received a tip earlier on Thursday of another possible Caylee sighting. She said a caller reported a sighting at a McDonald's in Coral Springs.

The search of the river was the second in four days. A two-man dive team organized by Padilla searched the same river on Monday but did not find anything. Padilla, who held a prayer vigil for Caylee at the park on Tuesday, had said that he would be leaving Orlando after the service.

"Nobody else is doing it. Everybody left town," said Padilla when asked why he decided to lead another search. "We're bringing up the remains. We feel confident that the remains are there."

"The water smells, there's alligators, there's snakes, there's zero visibility," a diver said.

Family Spokesman Fired

The Anthony family fired its spokesman on Wednesday, accusing him of accepting payments for booking Caylee Anthony's grandparents on TV shows.

Mark NeJame, the attorney representing George and Cindy Anthony, provided an invoice to Local 6 News, which showed Larry Garrison's purported signature on a bill to NBC for $6,500.

NeJame said his clients did not know that Garrison was being compensated and the Anthonys were not paid any of the money.

"He was basically being a pimp," NeJame said.

Garrison released a statement, saying he was not fired but resigned his position.

"Due to the erratic behavior over the last several months exhibited by the Anthony family, Larry Garrison is resigning as their spokesperson. It is my opinion that others have manipulated them into situations, that would not dignify the family. I can no longer be part of that behavior. I wish them all the peace and resolution they so deserve. The truth always comes out in the end, and in this case 'The truth is better than the spin,'" the statement said.

Possible Caylee Sighting Proved False

A possible Caylee sighting inside a Gainesville grocery store turned out to be false, according to police.

George and Cindy Anthony went to Gainesville after the sighting at a Winn Dixie over the weekend, but police said they have confirmed the identity of the girl, who is not Caylee.

A national search continues for Caylee.

Bounty Hunter Holds Prayer Vigil

Celebrity bounty hunter Leonard Padilla on Tuesday held a prayer vigil for Caylee, a day after he angered the missing girl's grandparents by calling it a memorial service.

Padilla, who once bailed out Casey Anthony from jail, said he made a poor choice of words in describing the service, which was held at Blanchard Park to honor Caylee.

Richard Grund led the prayer vigil, quoting scripture and talking about Caylee. Grund, the father of Casey Anthony's ex-finance Jesse Grund, at one point mistakenly thought he was Caylee's grandfather.

"Caylee was a gift -- is a gift -- and she is loved, and that's why you're here," Grund said.

About 100 people participated in the 9 a.m. prayer vigil, including Equusearch volunteers and protesters who once gathered outside Caylee's grandparents' home.

Padilla said he organized the service to give the community closure.

"Finality for some of the people who have been out here 30 or 40 searches. I've made two trips out here," Padilla said. "You have to believe in something, and I want to believe that (Caylee's) final resting place where she met God was in this place rather than a garbage dump."

Padilla said he's convinced that Casey Anthony dumped Caylee's body in the Little Econ River at Blanchard Park.

Some people have questioned Padilla's motives, calling his involvement a publicity stunt.

Anthonys Lash Out

George and Cindy Anthony went to Blanchard Park Monday, where Padilla's divers were searching the Little Econ River for Caylee, and lashed out at him, not for the search but because he said he would conduct a memorial service for Caylee.

"No one here is giving a flipping, God's anything about her, except us two right here," said Cindy Anthony while pointing to her husband, George Anthony. "I'm not on TV every night on Nancy Grace with this stuff."

"Do you think it's all about publicity for him?" Local 6 News reporter Mike DeForest asked Cindy Anthony.

"What do you think?" she replied. "I have not a problem with him being out here. I have a problem with him having a memorial service for Caylee (on Tuesday)," Cindy Anthony said. "You'd have a problem with it, too."

"Why do you feel it's your place to host (a memorial service)?" DeForest asked Padilla.

"Nobody else is doing it," he said. "You want to do it?"

Padilla said despite the Anthonys' protest, the service will be held at the park. Padilla said he believes Caylee is dead and that her body is likely somewhere in the river.

"I haven't got a clue what she's thinking or why she even bothered to come out here," Padilla said of Cindy Anthony. "She knows exactly who I am, and what I'm about."

Padilla said he will not lead any more searches for Caylee and only expects to be in Orlando for a few more days.

Padilla said he received a tip from a friend of Casey Anthony, leading to the dive search. Padilla said the friend showed him a picture of a cross that she had taken at Blanchard Park and it matched some arts and crafts that were in Anthony's room.

"She could have easily gone to the park, taken the body out, ruptured the bag when she pulled the body out of the trunk -- which left fluids in the trunk -- gotten it all over herself, taken it to the edge of the water and dumped it in there," Padilla said.

Padilla said that theory would explain a stain on one of Anthony's shirts that Cindy Anthony cleaned before it was turned over to investigators.

Gag Order Hearing Delayed

A hearing on a sweeping gag order in the case against Casey Anthony was postponed on Monday.

It is not known when the hearing, which would restrict attorneys, witnesses, law enforcement and the Anthony family from commenting publicly about the case, will be held. The purpose of the order would be to protect potential jurors from being influenced by pretrial publicity, Local 6 News reported.

Watch Local 6 News for more on this story.