Surveillance video from the day before tourist Robyn Gardner vanished in Aruba shows her and the prime suspect in her disappearance walking the same stretch of beach from which she would vanish a day later.

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Gardner, 35, has been missing since Aug. 2. Gary Giordano, who is being held in an Aruban jail, has told authorities that the two went snorkeling and the Maryland woman got swept out to sea. The two were in the midst of a weeklong trip to the Caribbean and had met on an online swingers’ website.

The surveillance video, obtained exclusively by ABC News, shows the travel companions at the beach Aug. 1.

The twosome’s rented Toyota Rav-4 is visible and grainy video shows Giordano of Gaithersburg, Md., and Gardner walking near the restaurant where the two would share one final meal the next day. They are walking on the beach at around 3:41 p.m., about the same time she would disappear Aug. 2. Gardner is wearing the same printed sundress she wore the day she vanished.

ABC News legal analyst Dan Abrams said the video could show that the suspect was preparing to carry out a crime in Gardner’s disappearance.

“You’ve also got the possibility now that he may have been casing it the day before so all of these pieces together are going to lead investigators in their minds to believe they have a right guy,” Abrams said.

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