He was rushed to Fortis Hospital where he was declared brought dead, police said.
The police said Dahiya along with some friends from the Indian Foreign Service (IFS) and the Indian Revenue Service (IRS) had organised the poolside party at the Foreign Service Institute (FSI) on Monday night.
During the party, they made a decision to swim in the pool at the club. His family said they suspected foul play.
"Many young officers, including Dahiya, attempted to rescue her", a police official said.
"The men pulled the woman out of the water, but as the drama came to end, the woman realised Dahiya was no where to be seen. Soon, he was discovered floating", the officer said.
A medical officer was called but attempts to revive him with CPR before he was taken to hospital did not help.
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IMPARD condoles demise of JK Cadre IAS officer Ashish Dahiya J&K Institute of Management, Public Administration and Rural Development (IMPARD) today held a condolence meeting on the sad demise of Ashish Dahiya, a 2016 Batch J&K Cadre IAS officer, who passed away yesterday evening at New Delhi.
While Dahiya's family has alleged foul play claiming he was an excellent swimmer, police have ruled out any such possibility.
Demanding a CBI probe, Dahiya's father Narender Singh said his son was an experienced swimmer.
A team of senior officers is on the spot to collect evidence and to record statements of relevant persons regarding investigation of this tragic episode. Then, he had applied for the UPSC exam and cleared it. He was married for a year-and-a-half to his doctor (MBBS) wife Pragya Dahiya, who is also preparing for civil services.
The family of the deceased was informed who have reached Delhi.
Singh also told that Ashish had also won the director's gold medal a fortnight ago during his IAS training.
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