Police say a woman who was arrested after the death of a man at a flat in Leeds is under guard in hospital.
The 48-year-old was arrested after a 42-year-old man was found dead at the Saville Green high-rise, on Appleton Way, Burmantofts, on Saturday night.
A post-mortem examination carried out on Sunday failed to determine what caused his death.
Detectives are now waiting to interview the woman, who is currently too ill to be spoken to.
It is understood she was taken to hospital with medical problems unrelated to the incident at the flat.
Det Chief Insp Steve Snow said: “A post-mortem into this man’s death has proved inconclusive and further enquiries are underway to determine what happened at this address.
“We are awaiting for an opportunity to interview the woman, who remains under arrest and is detained under police guard in hospital.”
Officers were called to the flat at around 8pm on Saturday.
Despite treatment by paramedics, the man was pronounced dead at the scene.
An elderly neighbour said he hadn’t heard a disturbance and didn’t know anything about the incident until police knocked on his door.
Another resident, who did not want to be named, said: “I saw the ambulance and police car at around 8pm on Saturday.
“I was wondering why they were there and thought something must be going on. It’s a rough area, so anything is possible.”
The 46-year-old said she was upset by the news. “It’s scaring me now. I was a victim of crime myself three weeks ago and to think that you’re living in an area where this kind of thing is going on, that gets me worried.”
Anyone with information should ring 101 or Crimestoppers on 0800 555 111.