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‘Tell her we are all coming over there with baseball bats’ wrote one member in a series of ominous threats posted alongside Miss Costello’s address, after the alleged incident.

The threatening messages started eight weeks before the twice-divorced drug addict disappeared on September 2.

Her body was found in December dumped in a cloth potato sack alongside the remains of three other victims on Long Island.

The bodies of the four women were discovered around 500 feet apart along the same road that runs the length of Gilgo Island, a southern sandback of Long Island.

All had been strangled and stuffed in sacks. They are all thought to be victims of the macabre killer who has become known as ‘The Craigslist Ripper’.

The online threats first started on July 11 2010 when a message board member using the name Humiliatrix69 raged that he had been ‘suckered’ by Miss Costello in the alleged incident at her home in West Babylon, New York.

‘Seemed really friendly,’ his angry post read. ‘Provided the donation. She slipped away and got comfortable, and so did I. Then there was a knock at the door.’

Humiliatrix69 claimed two men, one of whom said he was Miss Costello’s boyfriend, rushed at him armed with baseball bats before fighting with him on the front lawn.

‘I made it clear that it wasn't over, so after posting this... I gotta go handle this,’ he wrote.

Shortly after, a fellow member called italyrider asked for her address and posted: ‘No one from this board needs to be involved. I have friends who can take care of this s**t.’

Humiliatrix69 replied with Miss Costello's address, a description of her home, and her phone number.

He also shared raunchy pictures that he had taken from her advert on newyorkbackpage.com where she advertised herself as a ‘Southern girl’ named ‘Carolina’, who was ‘short, sexy & a lot of fun’.

‘I could seriously do some time for the things I want to do to this provider and her boyfriend.’

But he then admitted to having cold feet and said revenge would not be worth it.