A 24-year-old woman from Mizoram was stabbed to death and her body was found lying in a pool of blood at her home here, police said Friday.
Police detained her male partner who is believed to be a suspect.
Juliet Zonunmawi's body was found lying in a pool of blood at her home in south Delhi's Munirka area by her neighbour Thursday night. She had sustained head injuries and stab wounds in her abdomen and thigh, police said.
Blood stains showing the imprints of footwear were found on the stairs, they said.
"The woman was lying in a pool of blood and had head injuries. She had been stabbed in the abdomen," a police officer told IANS.
Zonunmawi was taken to Safdarjung Hospital where doctors pronounced her dead.
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Police said Zonunmawi had come to Delhi around five years ago and had been staying in Munirka for the last few months with a male partner Virender Singh.
Singh, who went missing Thursday night, was picked up from the area Friday morning, the officer said. He is being questioned.
Zonunmawi was working in a call centre while Singh was preparing for the civil services exam.
People from the northeast gathered outside the local police station and protested against the attacks on people from the region.
Early this year, a 29-year-old student from Arunachal Pradesh was beaten to death by three shopkeepers in south Delhi's Lajpat Nagar area.