East London
The incident took place at Gants Hill roundabout in Redbridge, east London, on Friday evening.
A 50-year-old man was arrested on Sunday after a clip of the incident went viral online.
The killing is the latest in a wave of knife crime which has engulfed the capital this year.
The Met Police have released a CCTV image of the man.
He has been bailed and women are urged to remain alert.
Don't have nightmares...
They have been detained on suspicion of attempted murder.
Just a normal Tuesday.
Victim is aged in his 40s.
The death came amid a spate of violence in London.