The crime came to light after neighbours alerted the police about a foul smell coming out of the flat.
According to police officials, 28-year-old Aftab Poonawala of Mumbai has been arrested in the case, and some severed body parts of the woman, Shraddha Walkar, have been recovered.
The reported 'confessions', including those allegedly made before a magistrate, by Mehrauli killing accused Aaftab Amin Poonawala do not have conclusive legal validity, experts said, doubting that several key conditions were not fulfilled.
A 25-year-old man allegedly stabbed to death his father, mother, sister and grandmother following a quarrel in southwest Delhi's Palam area, police said on Wednesday.
Maharashtra Deputy Chief Minister Devendra Fadnavis had last week said the government would study laws on "love jihad" framed by other states and take an appropriate decision.
A section of lawyers on Thursday evening at a court premises in New Delhi shouting slogans against Aaftab Amin Poonawala, accused in the Mehrauli killing case.
A Delhi Police team searched for the murder weapon at a forest in Gurugram using a metal detector on Saturday, but returned empty-handed after one-and-a-half-hours, sources said.
A yellow-sari daintily clad Indrani was beaming broadly and it seemed like for the first time, for her, Rahul had done something right. Vaihayasi Pande Daniel reports from the Sheena Bora Murder Trial.
Union Home Minister Amit Shah on Thursday said the Bharatiya Janata Party is committed to bring Uniform Civil Code (UCC) in the country but only after following all democratic processes and discussions on it.