Amit Bachchan and Shivani got married in November last year and neighbours told police that they had a strained relationship fraught with frequent quarrels.
Last night, Amit returned home after a party and an argument broke out between the couple, police said.
Amit hit Shivani at head with some sharp-edged object. Shivani, who works in a private company in Gurgaon, suffered severe head injuries.
Later, Amit hanged himself from the ceiling fan using the cable which later broke and the body fell down, police said.
The incident came to light at around 5:30 AM when a PCR call was made by a security guard of the building after hearing Shivani's call for help.
"A police team reached the spot and found the eighth floor flat bolted from inside. We had to enter the house from a neighbour's balcony," said Additional DCP (southwest) Chinmoy Biswal.
Shivani was found injured. She could not make a phone call because her mobile was getting charged in the drawing room. She had also thrown a flower pot from the window of her room to garner attention but it went unnoticed. Later, her screams were heard by a security guard who made a PCR call.
"We have not recovered any suicide note from the spot. There are no signs of forced entry in the house and prima facie it seems that Amit tried to kill his wife and then committed suicide.
"Shivani, who is out of danger now has told us that she was sleeping in another room when Amit attacked her," said Biswal.
Police is investigating the case under section 174 CrPc and looking into other angles as well. Crime and forensic teams have picked circumstantial evidence from the spot.