Florist,72, held over raid death.
Police were called to the florist in Old Trafford, Greater Manchester, on Tuesday evening after reports that a man had been injured.
Officers arrived to discover that a number of men had attempted to rob the shop in Shrewsbury Street.
A 30-year-old man was taken to hospital with a stab wound but died a short time later.
The 72-year-old shopkeeper, named locally as Cecil Coley, remained in hospital overnight after he was injured in the incident.
A spokesman for Greater Manchester Police said a 19-year-old man presented himself at Manchester Royal Infirmary with stab wounds on Tuesday. He has been arrested on suspicion of robbery and also remained in hospital overnight.
Chief Superintendent Mark Roberts, from GMP's Trafford Division, said the shopkeeper's injuries were "not life threatening" and that he will be spoken to in due course.
HUNT FOR CLUES: Scenes of crime officers in Shrewsbury Street, Manchester