Local media are calling it a suicide, but Singapore officials are waiting for toxicology test results.
Radtke formerly worked with Apple and other Silicon Valley tech firms on developing digital payment systems.
Radtke’s death brings the number of questionable financial-sector deaths this year to eight.
Li Junjie’s suicide marked the third mysterious death of a JPMorgan banker. So far, there is no other known link between any of the deaths.
Gabriel Magee, 39, a vice president with JPMorgan’s corporate and investment bank technology arm in the UK, also jumped to his death, from the roof of the bank’s 33-story Canary Wharf tower in London, on Jan. 28.
On Feb. 3, Ryan Henry Crane, 37, a JPM executive director who worked in New York, was found dead inside his Stamford, Conn., home.
A cause of death in Crane’s case will not be determined until a toxicology report is complete, according to a spokesperson for the Stamford detectives division.
The report is expected within two weeks.
Two other bankers have also taken their lives outside of JPMorgan.
On Jan. 31, Mike Dueker — chief economist at Russell Investments and a former Federal Reserve bank economist — was found dead at the side of a road that leads to the Tacoma Narrows Bridge in Washington state, according to the Pierce County Sheriff’s Department. He was 50.
On Jan. 26, William Broeksmit, 58, a former senior risk manager at Deutsche Bank, was found hanging in a house in South Kensington, according to London police.