Singapore's police say they are investigating the "unnatural death" of a young American woman who headed a company dealing in the Bitcoin virtual currency.
Autumn Radtke, chief executive of Singapore-based Bitcoin exchange company First Meta, was found dead in her apartment in the city-state last month.
A local technology website reported she had committed suicide, but later updated its report to say it was "unclear" how she died.
The Singapore Police Force said on Thursday they received a call on the morning of February 26 requesting assistance at a high-rise residential building.
"Upon police's arrival, a woman in her 20s was found lying motionless at the said location," a police statement said.
"She was pronounced dead at scene by paramedics. Police are investigating the unnatural death," the statement said.
A source, who asked not to be named, confirmed that Radtke was a US citizen. Media reports said she was 28 years old.
News of Radtke's death first surfaced in the technology startup community, which has a thriving presence in Singapore.
First Meta announced Radtke's death on its website but did not give a cause.
"The First Meta team is shocked and saddened by the tragic loss of our friend and CEO Autumn Radtke," the company said in a brief statement.
"Our deepest condolences go out to her family, friends and loved ones. Autumn was an inspiration to all of us and she will be sorely missed," the statement said, without giving details.
First Meta provides a web-based exchange for users to buy, sell and trade virtual currencies for real money.
Radtke moved to Singapore in 2012, and her death comes amid controversy surrounding the Bitcoin virtual currency.
On February 28, Japan-based MtGox Bitcoin exchange filed for bankruptcy protection, with its chief executive saying it had lost the equivalent of nearly half a billion dollars in a possible theft.
On Tuesday, Canada-based Flexcoin was forced to shut down, saying that someone attacked its systems and stole nearly $600,000 worth of Bitcoin.
* Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or Suicide Call Back Service 1300 659 467 or follow @LifelineAust @OntheLineAus @kidshelp @beyondblue @headspace_aus @ReachOut_AUS on Twitter.