SINGAPORE—The CEO of a virtual-currency exchange was found dead near her home in Singapore.

A police spokesman said Thursday that initial investigations indicated there was no suspicion of “foul play” in the Feb. 26 death, meaning officers do not suspect murder.

The spokesman said police found 28-year-old Autumn Radtke, an American, lying motionless near the apartment tower where she lived.

Police have so far classified the death as “unnatural,” which can mean an accident, misadventure, or suicide.

Radtke’s company, First Meta, said it was “shocked and saddened by the tragic loss.”

First Meta allows users of virtual currencies such as bitcoin to trade and cash out the currencies. It is one of several such exchanges.

The future of bitcoin has been under scrutiny since the collapse of the Mt. Gox exchange in Tokyo last month.

Radtke had worked at other tech companies.

Postings on her Facebook page showed her to be a believer in the potential of virtual currencies.

Last month she linked to an article on entrepreneurs suffering depression, commenting above the link: everything has its price.

In another shocking Bitcoin development, Newsweek magazine has reported that the creator of the digital currency is a 64-year-old Japanese-American man living in the Los Angeles area.

The magazine published the results of an investigation concluding that Dorian S. Nakamoto, a former defense industry and government employee, is the mysterious computer coding and cryptography expert who authored the seminal paper on Bitcoin in 2009 and created the software that serves as the backbone of the currency’s system.

The initial Bitcoin paper carried the name of Satoshi Nakamoto. Since the author otherwise chose to remain private and anonymous, it had been widely assumed the name was a pseudonym. The Nakamoto living in Temple City, Calif., used to be named Satoshi, Newsweek said.

Gavin Andresen, the chief scientist of the Bitcoin Foundation who had been one of the few people to communicate with Satoshi Nakamoto, didn’t immediately indicate whether he could identify Dorian Nakamoto as Bitcoin’s creator. Andresen said in a message on Twitter that he regrets talking to the magazine about Nakamoto. He said he was disappointed that Newsweek decided to “dox,” or document, the Nakamoto family.

Until now, Satoshi Nakamoto was thought to be a pseudonym for a programmer or group of programmers who wrote the paper and the source code for Bitcoin. The code has since been handed off to a loose group of experts affiliated with the foundation, a Seattle-based advocacy group.

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According to Newsweek reporter Leah McGrath Goodman, when Dorian Nakamoto was confronted at his home and asked about Bitcoin, he responded, “I am no longer involved in that and cannot discuss it. It’s been turned over to other people.”

The magazine said Dorian Nakamoto, who was was born in Japan, attended California State Polytechnic University, worked for defense contractors on classified military projects and eventually the Federal Aviation Administration.

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