The heartbroken husband of a North Carolina woman who vanished on vacation in Grenada says he has accepted investigators' theory that no foul play was involved in her disappearance. 

Elizabeth 'Liz' Waddell, 43, was on a trip with a friend when she disappeared while swimming off Grand Anse Beach in St George's on July 22.

In a devastating update, Liz's husband, Cailen, said he agrees with investigators' leading theory about what happened to his wife. 

'Over the past week, family, friends, local authorities, and countless Grenadian citizens have devoted hundreds of hours to trying to locate her. Despite our exhaustive efforts, we have not been successful. 

'After careful and thoughtful consultation with family, local authorities, the US Embassy, and others here in Grenada, I join authorities in believing there was no foul play,' he added.

Liz and her friend had spent the first 10 days of their trip at a resort on the west side of the island, but decided to move into an Airbnb in the south on July 21, Grenada Police Chief Randy Connaught said at a news conference on Tuesday.

The following morning, at 11.36am, she was seen walking toward a jetty near the Airbnb. 

Liz then sat in the sun for several minutes before ultimately deciding to jump into the ocean at 11.51am, surveillance footage from the Airbnb shows.

Three minutes later, a small boat could be seen passing by as Liz's traveling companion adjusted a beach chair.

She was then seen swimming toward Grand Anse Beach at 12.04pm. Then, at around 12.46pm, her friend could be seen walking outside to look for her before returning to the Airbnb.

But Liz was never seen in the footage 'returning from the water,' and she was reported missing at 5.50pm, Connaught said at the news conference.

'The missing person investigation into her disappearance will continue, and we are specifically hopeful to determine her actions between the time she was last seen on video and the time she was seen in the water around 5.30pm, as well as any further sightings,' the husband said in his recent update.

Cailen said his beloved wife had 'communicated her confidence in her swimming and location, as well as the beauty of the island.'

By Friday, Cailen and their adult daughter traveled from their home in Cary, North Carolina, to the island to aid in the search efforts.  

As the search for the missing mother-of-one now stretches into a week, her family has created a website, FindLiz.com, to share updates on the investigation.

'We have now seen video footage that confirms on Wednesday, Liz was last seen around 12.04pm, about 20 ft at most from shore in water about five feet deep swimming towards the beach at Grand Anse,' Cailen posted on the site Tuesday.

'I went out and did this swim yesterday,' he noted. 'It is easy, there are lots of rocks you can stop at if you need.'

'The water is shallower near shore, where Liz could touch if she wanted, and the water is like a lake, not like ocean water we experience in North Carolina,' added Cailen, who serves as the Parks, Recreation and Cultural Resources manager in the city of Cary.

The worried husband later also shared a photo from the surveillance footage showing Waddell in blue and white striped shorts and a burnt orange loose crop top as she left the Airbnb. He now believes she went swimming in those clothes.

When Liz's traveling companion finished an online course later in the day, she then went out to look for her once again – only to discover her towel still lying on the pier, longtime friend Amanda Romano-Harmon, told WRAL.

After several hours, the friend began to get nervous and called Liz's husband, who was working, to inform him that she was missing.

'She was starting to panic because she knew Liz didn't have her phone or anything with her,' said Romano-Harmon, who has been serving as a spokesperson for the family. 'And so they wound up filing a missing persons report right away.'

Cailen also noted in his statement online that his wife did not have her wallet, shoes, cash or cards with her when she jumped in the water. It remains unclear what happened to the mother-of-one in the aftermath.

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