A man seen fleeing a road where an elderly woman was found dead in her Birmingham home is being sought by West Midlands Police.
Riasat Bi, 86, was found stabbed in Aubrey Road, Small Heath at about 11am on Thursday 12 July.
West Midlands Police want to speak to a man who was seen running from the area and into Coventry Road at the same time.
A 20-year-old man was arrested on suspicion of murder and is currently being detained in hospital in Stoke-on-Trent.
He will be questioned once discharged, police said.
Officers said his injuries are not life-threatening.
Detective Inspector Harry Harrison said officers believe the other man seen running from the road may have information and appealed for him, or anyone who saw him, to come forward.
From Coventry Road, he ran into Malmesbury Road, along Oldknow Road and into Waverley Road, where he was last seen by the bridge.
The man is described as Asian, around 5ft 10in and of slim build. He was wearing dark clothing and a baseball cap.
An 18-year-old man also injured in the attack remains in a critical but stable condition in hospital, the police added.
The address had been cordoned off to allow forensic experts to examine the scene.
Police urged anyone with information on the murder to call the homicide team on 101 or Crimestoppers anonymously on 0800 555 111.