It is yet to be ascertained whether she killed herself or was shot dead by the man, suspected to be her paramour, inside whose car her body was found, police said.
The deceased woman has been identified as Anjali, who lived in outer Delhi's Rohini with her husband and two children.
Anjali's friend Naveen (28) met her near the Banta park in Maurice Nagar in the evening and they were talking to each other sitting inside Naveen's SUV, said a police official.
A thorough check was conducted and police spotted Naveen's car in Maurice Nagar and inside the vehicle, they found Anjali's body. A manhunt was launched and within minutes, Naveen was detained for questioning, the official said.
Naveen, a property dealer residing in Malka Ganj area, too got married earlier this month. He knew Anjali from the past seven year. It is suspected that both of them were in a relationship.