Missing Sandrine Jourdan who ‘disappeared from the face of the earth’ was murdered according to her family, who received mysterious anonymous letters after she disappeared

The family of a missing mother are haunted by anonymous letters sent six months after her disappearance.

When Sandrine Jourdan, 38, mysteriously disappeared from the small town of Caboolture, Queensland in 2012, police quickly ruled her disappearance a suicide.

However, her family believes something much more sinister is going on after they receive mysterious letters from an unknown person.

The mother-of-three’s loved ones also reveal how her Facebook account was hacked

The new evidence, revealed on 60 Minutes Australia’s Under Investigation with Liz Hayes, casts strong doubt on police’s theory that Sandrine committed suicide.

Speaking to the programme, her sister Christine Day said: ‘It’s actually quite scary when you think this was sent to where the children were living at the time. Who especially does that six months after their mother went missing?’

The letters, sent to Sandrine’s former partner and father of her children, are signed by Rosetta Bunton – a person who appears not to exist.

Clinical psychologist Tamara Cavenett examined the letters and revealed that they continually imply that Sandrine was promiscuous.

The mother was called ‘a man-eater’ and the cruel notes claimed she ‘jumped from one man to another’.

They also contained personal details that only a few people would know, leading the family to believe the writer was someone close to the family.

Worryingly, in the days before she disappeared, Sandrine told a few people she was receiving threats and wrote in her diary that she feared for her life.

Her daughter Nakita Bulla said her mother was scared before she went missing, and “that has been completely overlooked.

“They made her look like she was paranoid, but she disappeared off the face of the earth,” she said.

Tamara added: ‘Through her diaries she made a number of comments about being afraid someone would hack into her computer.’

The program asked private investigators to conduct a forensic analysis of the mother’s laptop, during which they found a “highly sophisticated encryption program” – technology commonly used by intelligence agencies.

Meanwhile, a second computer belonging to Sandrine also raised alarm bells after previously being used to visit a human trafficking website.

Elsewhere in the program, Christine revealed that her sister’s account has been taken over by someone they don’t know and her passwords have been changed.

“Her Facebook was hacked, someone changed the passwords, access codes and such, we no longer have access to it,” she said.

‘Why weren’t all these warning signs looked at? I shouldn’t have to go into what evidence was or wasn’t given to the police, but that’s what we’ve had from day one. It makes me furious, it’s still very painful.’

Nakita added: “I’m 23 and I’ve had to connect the dots myself about what happened to my mother and it’s not my responsibility or my role to do that, it’s the police’s responsibility.

‘It feels like she’s been murdered. There’s someone who got away with something, it’s not fair and it’s not right. It’s disturbing, it’s exhausting and it makes me paranoid sometimes that it’s so easy for people to get away with things.

“Closure for me is finding my mother’s body, or just finding out what happened at a funeral and saying goodbye.”

The Queensland coroner’s office has decided to reopen the investigation into Sandrine’s disappearance.

Sandrine had been with a friend in Caboolture, just north of Brisbane, when she disappeared from the driveway on Friday, July 13, 2012, leaving only her coat on a fence post.

Sandrine’s family were aware that she suffered from depression, but said she kept a close eye on her mental health and had completed a healing course two weeks before her disappearance.

Police also appear to have dismissed the statements of witnesses, including Jan Martin, who lives near the property where Sandrine was last seen and claimed she heard three gunshots the day she went missing.

“I was in the front yard, right by the fence, and all of a sudden I heard ‘bang, bang, bang,'” she said.