Missing woman Madeline Bigatton's final text message to Bitcoin millionaire ...

The missing wife of an international Bitcoin entrepreneur sent a text message to her husband telling him to 'feed the dog' and left her ring in the car, moments before she disappeared.

Madeline Bigatton, 48, was captured on CCTV getting into her car in the driveway of her family home at Carss Park, in Sydney's south, on the morning of March 25. 

The mother-of-two then dropped her daughter at a friend's house nearby, and is believed to have driven up to Kurnell, where her black Kia Sorento was found parked later that night.

Mrs Bigatton has not been seen since.

Madeline Bigatton (second from right), 48, was last seen getting into her car in the driveway of her family home on March 25. (She is pictured with her husband John and their two daughters)

Madeline Bigatton (second from right), 48, was last seen getting into her car in the driveway of her family home on March 25. (She is pictured with her husband John and their two daughters)

Mrs Bigatton is pictured with her husband John (left), an international Bitcoin entrepreneur

Mrs Bigatton is pictured with her husband John (left), an international Bitcoin entrepreneur

Now three months since her disappearance, relatives revealed to Daily Mail Australia Mrs Biggaton's final message to her husband in which she asked him to care for their family pets.

'At about 3.30pm, she sends John some weird messages and says: 'Don't forget to feed the dog',' a relative said.

Mrs Bigatton held a senior position with a pharmaceutical company, and was an adoring mother to her daughters. 

The relative said Mrs Bigatton had hinted to family she was in a 'dark place' in the days before she vanished, but insisted it was totally out of character for her to do anything to harm herself.

'The day before she disappeared she said to her sister: "I'm not in a good place, I'm in a dark place",' the relative said.

'Then on Sunday she jumped in the car and takes her youngest daughter to a friends' house. She had packed her beach towel and then drives up to Kurnell. 

Police searched the area where Mrs Bigatton's car was found, but failed to find any trace of the missing mum. 

'When they got up there they found the car empty, with her rings inside. We assume she jumped off, but they searched for her body and never found it,' he said. 

The mother-of-two left her wedding rings in her car, messaged her husband to 'feed the dogs' and has not been seen since

Mrs Bigatton reportedly dropped her daughter at a friends' house before driving up the cliffs at Kurnell

Mrs Bigatton reportedly dropped her daughter at a friends'

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