Arnav Duggal had gone out to party with his friends, including his girlfriend, on June 12. They partied till the wee hours on June 13 and dropped his girlfriend at her flat in Dwarka and left for his home in Patel Nagar, his girlfriend told police.
After a few minutes, he returned to her home and said that was not feeling good and she asked him to stay over at her place. They went to sleep in separate rooms and after she woke up, she went to check on him and found him hanging with a ceiling fan, the police said.
A forensic team visited the room and collected samples. Police have seized Arnav's phone and it will be sent for forensic examination and call records will be examined, said a senior police officer.
His friends will be questioned to ascertain whether Arnav had displayed any suicidal tendencies.
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Arnav and his girlfriend worked with the same MNC in Gurgaon.
His family members have started an online petition demanding justice for him. They have alleged that he was killed by his girlfriend and her ex-boyfriend.
Arnav's father met P Kamraj, special commissioner of police (Law and Order), South, to demand a fair probe in the matter.
The body has been preserved at the AIIMS mortuary and an autopsy will be carried out there, said a senior police officer.