A TEEN model was found naked after plunging 14 floors to her death following a "drug-fuelled swingers party'', her grieving father has claimed.
Dutch national Ivana Smit, 19, enjoyed a successful career as a model in Malaysia after moving there with relatives when she was five years old.
After a night out in Kuala Lumpur on Thursday she returned to the 20th floor apartment of a wealthy American "cryptocurrency trader" and his Kazakhstan wife at 5am, her family claims.
Several hours later Ivana's naked body was found after she allegedly fell onto a sixth floor balcony.
Police said there were "no criminal elements" to the death, but Ivana's devastated father Marcel, as well as her mother and brother, have now arrived in the country and contacted Interpol to demand an investigation.
Ivana's grandfather Fredrik Smit, who has lived in Penang, Malaysia, for over two decades and raised Ivana there, said: "We cannot believe she fell from level 20 and the body was found at level 6.
"She was found there naked. Where are her shoes and underwear?
"We believe there is a criminal element in Ivana's death.
"Of course we don't believe the story from the police, because they can't give us photographs or a report from the scene.
"Ivana's father has contacted the Dutch ambassador and Interpol."
Marcel Smit claims Ivana, who had worked in fashion shows for Chanel and other brands, sent her boyfriend a message and selfie at 7.25am before she was found dead around seven hours later.
He told Dutch media: "At about 10am she would have fallen from the balcony. How is that possible? It is strange that she was not found until 3pm.
"She is tall, 1.81m, but the barrier is 1.2m high.
"She did not fall and did not jump either."
Marcel claims that police want to "close the case quickly" and that neighbours heard "shouts and an argument".
He said that he had been told the American couple are "swingers" who would take young models back to their apartment for parties and sex games.
He added: "Drugs and sex parties are not part of Ivana's world."
According to Ivana's father, alcohol and ecstasy were found in blood of his daughter and the American couple, who have not been named.
The model's uncle, Fred Agenjo, said: "Those are not drugs that you're going to sleep on.
"There are so many questions. Her clothes have been found, but her shoes and underwear have not.
"The police did not look at her mobile phone.
"The police also do not want to say whether traces of sexual intercourse have been found. We want a full investigation."
Ivana had first moved to Malaysia 13 years ago and lived with her grandfather Fredrik.
She was the second runner-up in Malaysia Supermodel Search 2014 and a leading model in the country.
Top cop Shaharuddin Abdullah said the case was an accident and appealed for more information from witnesses.
He said: "Our investigations so far and the post-mortem report show no elements of foul play."