In the mysterious case of the American Gabby Petito, the investigators assume a homicide after the forensic medical examination.

The cause of death has not yet been clearly clarified, "since the final autopsy results are still pending," said the FBI on Tuesday evening (local time).

On the other hand, it has been unequivocally confirmed that the body found on Sunday in the state of Wyoming was the 22-year-old Petito.

There was still no trace of her 23-year-old fiancé Brian Laundrie.

The case is making waves in the USA and is also attracting international attention - not least because the Florida couple shared numerous pictures and videos from their trip on social networks.

The two had set out on a trip across the United States that summer.

On September 1, the fiancé came back home to Florida alone, according to the police, ten days later Petito's parents reported their daughter as missing.

Deceptive social media posts

Investigators suspected that Gabby was last in the Grand Teton National Park area of ​​Wyoming.

They had looked for her there over the weekend and finally found her body.

Why the journey of the couple, who looked happy in pictures, came to a fatal end is open.

The image taken by a police body camera leaves a completely different impression than the pictures of the couple. The police were called to the vehicle of the two in mid-August about a possible domestic violence case. The completely distraught and crying Petito said in the video that she suffers from obsessive-compulsive disorder and that an argument had broken out. She also slapped her fiancé in the face. The police did not file a complaint, but obliged the couple to spend one night separately.

The investigators hope for answers from Brian Laundrie. He was also reported missing by his parents last Friday. He had not spoken to investigators before and only communicated through his lawyer. He had actually announced a press conference for Tuesday, but then canceled it again. The investigators had also searched the house of the 23-year-old's parents. He had lived there with Petito before their trip. Pictures showed investigators carrying large boxes out of the house.

Gabby's father, Joe Petito, blamed Brian Laundrie's parents on television.

He asked how it could be that Brian Laundrie had returned without Gabby and that the parents had not acted earlier.

After all, his daughter lived there too.

In his opinion, they are currently complicit.

"That's not how you raise a child," he said.

He understands that one wants to protect his son, but for him the parents are "cowards".

Meanwhile, numerous hobby detectives are trying to solve the case online.

They investigate photos and videos that Gabby shared on social networks.

It is hoped by many that this huge exposure might help track down Gabby's fiancé.