ORLANDO, Fla. -- Brand new evidence could potentially tie Casey Anthony to her daughter's body. A mystery videotape of the crime scene, shot by one of the Anthonys' private investigators weeks before Caylee was found, reportedly shows their other private investigator on the phone. But who is he talking to?

That mystery caller could be a big clue that connects Casey to the crime scene.

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VIDEO REPORT: Mystery Videotape Could Hold Clue

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Eyewitness News has learned the Anthonys' two private investigators came to the discovery scene on November 15 and 16, a Saturday and Sunday, possibly because they didn't find Caylee's remains right away.

Law enforcement is trying to find out whether inside information led them there.

Eyewitness News has learned that the Anthonys' private investigator, Dominic Casey, is seen a month before the body was found on the November 15 videotape at the scene on the phone. California bounty hunter Leonard Padilla, who first sprung Casey out of jail, says he saw Dominic Casey on the videotape, because the person who shot it, private investigator Jim Hoover, showed it to him.

"He's standing there, or somebody's standing there, filming Dominic down the road and Dominic's on a cell phone, and you can see the fence, the signs on the left, the fence is there, everything is there," Padilla told Eyewitness News.

Finding out who Dominic Casey was talking to that day on the phone at the scene could be important to investigators in finding out whether inside information brought him and the other private eye to the area.

Padilla told Eyewitness News that Hoover claims Dominic Casey told him on November 15 that Caylee's remains had been found and that the two of them were going to look for them. Dominic Casey told Eyewitness News on Friday he was talking to his ill daughter on the phone that day and insists he was only there to rule out a tip from one of Casey's friends.

Padilla said he asked Hoover about Dominic Casey's phone call.

"I even asked him, 'Who's he talking to?' He said, 'I don't know.' 'Could you hear what he was saying?' 'No, I couldn't hear.' He was 100 yards away," Padilla explained.

Both Dominic Casey and Padilla said Hoover claims to have recorded over most of the tape he shot at the scene, but Eyewitness News has learned that Hoover is planning a news conference for Monday.