Auriane Nathalie Laisne’s blood-drained body was discovered in Italy‘s Aosta Valley over the weekend.
A hiker stumbled upon her decomposing corpse on April 6, and it is thought the victim had been killed between 26 and 27 March.
The exact date is unclear as the low temperatures preserved the body well, reported Italian media.
Her clothes were drenched in blood, and police told CNN that some of the blood at the site had been scraped off the floor and removed.
Laisne suffered multiple stab wounds to her neck and stomach, as well as gunshots to her neck and body that may have been inflicted after her death, autopsy reveals.
The cops reported that there was no indication of struggle.
The Frenchwoman was reportedly searching for a haunted house, in what police suspects, a ghost hunting competition.
A police spokesperson told CNN that the victim had informed family members of her plans before leaving her hometown of Saint-Priest, near Lyon.
The bizarre TikTok trend which has taken over France sees young people set off on exploring abandoned buildings.
Laisne was found without documents or a cellphone on her – with only a pack of pink marshmallows and some groceries from a local store by her side.
She had been wearing beige leggings, sweatshirt and a long dark coat.
The victim’s family is said to have travelled to Italy to identify her body.
The cops are also probing theory of a “consented murder” or a sacrifice.
A witness reported seeing Laisne with a young man dressed “like vampires” in the days leading up to her death.
According to the testimony, the young woman appeared pale and “emaciated”, and looked like a “walking corpse”.
The man – later identified as Teima Sohaib – was described as having “an olive” skin and dark “curls”, and “didn’t seem like a violent guy”, witness added.
The police has launched a manhunt for the 21-year-old Italian man and shortly apprehended him in Lyon on suspicion of murder.
According to cops, Sohaib crossed the border to France through the Mont Blanc Tunnel shortly after the woman’s death.
Sohaib had been wanted in France since the end of March for “violation of the judicial control” over reported violence against the victim.
The two had been in a long-distance relationship, but Sohaib was banned from approaching Laisne, reported La Republica.
The Grenoble prosecutor, Eric Vaillant, wrote: ” He had been placed under judicial control on 13 January following the complaint of domestic violence and threats.
“In accordance with the prosecution’s requests, the judge had notified him of the ban on coming into contact with the victim.”
The prosecutor’s office has supported the theory of premeditated murder, reported Skytg24.
The chief prosecutor of Aosta, Luca Ceccanti, told reporters during press-conference: “It was not a case of rapture, jealousy or passion.
“It is a classic femicide which was determined by a motive of possession and the annulment of the victim’s will.”